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I am having exactly same issue with Graffle on Leopard. I am attaching the relevant logs from the system log. (I am using MacBook Pro C2D 2.2 with 4GB RAM).

Mar 25 20:24:41 MBPro15 kernel[0]: NVChannel(GL): Graphics channel exception! status = 0xffff info32 = 0xd = GR: SW Notify Error
Mar 25 20:24:54 MBPro15 kernel[0]: 0000000c
Mar 25 20:24:54 MBPro15 kernel[0]: 00200000 00005097 0000047c 00000000
Mar 25 20:24:54 MBPro15 kernel[0]: 00000486 00000f04 bfff7dd4 00000003
Mar 25 20:24:54 MBPro15 kernel[0]: 00000000 00000000 00000002
Mar 25 20:24:54 MBPro15 kernel[0]: 0000000c
Mar 25 20:24:54 MBPro15 kernel[0]: 00200000 00005097 0000047c 00000000
Mar 25 20:24:54 MBPro15 kernel[0]: 00000486 00000f04 bfff7dd4 00000003
Mar 25 20:24:54 MBPro15 kernel[0]: 00000000 00000000 00000002
Mar 25 20:24:54 MBPro15 kernel[0]: NVChannel(GL): Graphics channel exception! status = 0xffff info32 = 0x3 = Fifo: Unknown Method Error
Mar 25 20:24:54 MBPro15 kernel[0]: 0000000b
Mar 25 20:24:54 MBPro15 kernel[0]: NVChannel(GL): Graphics channel exception! status = 0xffff info32 = 0x3 = Fifo: Unknown Method Error
Mar 25 20:24:54 MBPro15 kernel[0]: 0000000b
Mar 25 20:25:06 MBPro15 kernel[0]: NVChannel(GL): Graphics channel timeout!
Mar 25 20:25:06 MBPro15 kernel[0]: NVChannel(GL): Graphics channel exception! status = 0xffff info32 = 0x3 = Fifo: Unknown Method Error
Mar 25 20:25:06 MBPro15 kernel[0]: 0000000b
Mar 25 20:25:06 MBPro15 kernel[0]: NVChannel(GL): Graphics channel exception! status = 0xffff info32 = 0x3 = Fifo: Unknown Method Error
Mar 25 20:25:06 MBPro15 kernel[0]: 0000000b
Mar 25 20:25:06 MBPro15 kernel[0]: NVChannel(GL): Graphics channel exception! status = 0xffff info32 = 0x3 = Fifo: Unknown Method Error
Mar 25 20:25:06 MBPro15 kernel[0]: 0000000b
Mar 25 20:25:06 MBPro15 kernel[0]: NVChannel(GL): Graphics channel exception! status = 0xffff info32 = 0x3 = Fifo: Unknown Method Error
Mar 25 20:25:06 MBPro15 kernel[0]: 0000000b
Mar 25 20:25:06 MBPro15 kernel[0]: NVChannel(GL): Graphics channel exception! status = 0xffff info32 = 0x3 = Fifo: Unknown Method Error
Mar 25 20:25:06 MBPro15 kernel[0]: 0000000b
Mar 25 20:25:06 MBPro15 kernel[0]: NVChannel(GL): Graphics channel exception! status = 0xffff info32 = 0x3 = Fifo: Unknown Method Error
Mar 25 20:25:06 MBPro15 kernel[0]: 0000000b
Mar 25 20:25:06 MBPro15 kernel[0]: NVChannel(GL): Graphics channel exception! status = 0xffff info32 = 0x3 = Fifo: Unknown Method Error
Mar 25 20:25:06 MBPro15 kernel[0]: 0000000b
Mar 25 20:25:06 MBPro15 kernel[0]: NVChannel(GL): Graphics channel exception! status = 0xffff info32 = 0x3 = Fifo: Unknown Method Error
Mar 25 20:25:06 MBPro15 kernel[0]: 0000000b
Mar 25 20:25:06 MBPro15 kernel[0]: NVChannel(GL): Graphics channel exception! status = 0xffff info32 = 0x3 = Fifo: Unknown Method Error
Mar 25 20:25:07 MBPro15 kernel[0]: 0000000b
Mar 25 20:25:07 MBPro15 kernel[0]: NVChannel(GL): Graphics channel exception! status = 0xffff info32 = 0x3 = Fifo: Unknown Method Error
Mar 25 20:25:07 MBPro15 kernel[0]: 0000000b
Mar 25 20:25:07 MBPro15 kernel[0]: NVChannel(GL): Graphics channel exception! status = 0xffff info32 = 0x3 = Fifo: Unknown Method Error
Mar 25 20:25:07 MBPro15 kernel[0]: 0000000b
Mar 25 20:25:07 MBPro15 kernel[0]: NVChannel(GL): Graphics channel exception! status = 0xffff info32 = 0x3 = Fifo: Unknown Method Error
Mar 25 20:25:07 MBPro15 kernel[0]: 0000000b
Mar 25 20:25:07 MBPro15 kernel[0]: NVChannel(GL): Graphics channel exception! status = 0xffff info32 = 0x3 = Fifo: Unknown Method Error
Mar 25 20:25:07 MBPro15 kernel[0]: 0000000b
Mar 25 20:25:07 MBPro15 kernel[0]: NVChannel(GL): Graphics channel exception! status = 0xffff info32 = 0x3 = Fifo: Unknown Method Error
Mar 25 20:25:07 MBPro15 kernel[0]: 0000000b
Mar 25 20:25:07 MBPro15 kernel[0]: NVChannel(GL): Graphics channel exception! status = 0xffff info32 = 0x3 = Fifo: Unknown Method Error
Mar 25 20:25:07 MBPro15 kernel[0]: 0000000b
Mar 25 20:25:07 MBPro15 kernel[0]: NVChannel(GL): Graphics channel exception! status = 0xffff info32 = 0x3 = Fifo: Unknown Method Error
Mar 25 20:25:07 MBPro15 kernel[0]: 0000000b
Mar 25 20:25:07 MBPro15 kernel[0]: NVChannel(GL): Graphics channel exception! status = 0xffff info32 = 0x3 = Fifo: Unknown Method Error
Mar 25 20:25:07 MBPro15 kernel[0]: 0000000b
Mar 25 20:25:07 MBPro15 kernel[0]: NVChannel(GL): Graphics channel exception! status = 0xffff info32 = 0x3 = Fifo: Unknown Method Error
Mar 25 20:25:07 MBPro15 kernel[0]: 0000000b
Mar 25 20:25:07 MBPro15 kernel[0]: NVChannel(GL): Graphics channel exception! status = 0xffff info32 = 0x3 = Fifo: Unknown Method Error
Mar 25 20:25:07 MBPro15 kernel[0]: 0000000b
Mar 25 20:25:07 MBPro15 kernel[0]: NVChannel(GL): Graphics channel exception! status = 0xffff info32 = 0x3 = Fifo: Unknown Method Error
Mar 25 20:25:07 MBPro15 kernel[0]: 0000000b
Mar 25 20:25:07 MBPro15 kernel[0]: NVChannel(GL): Graphics channel exception! status = 0xffff info32 = 0x3 = Fifo: Unknown Method Error
Mar 25 20:25:07 MBPro15 kernel[0]: 0000000b
Mar 25 20:25:07 MBPro15 kernel[0]: NVChannel(GL): Graphics channel exception! status = 0xffff info32 = 0x3 = Fifo: Unknown Method Error
Mar 25 20:25:07 MBPro15 kernel[0]: 0000000b
Mar 25 20:25:07 MBPro15 kernel[0]: NVChannel(GL): Graphics channel exception! status = 0xffff info32 = 0x3 = Fifo: Unknown Method Error
Mar 25 20:25:07 MBPro15 kernel[0]: 0000000b
Mar 25 20:25:07 MBPro15 kernel[0]: NVChannel(GL): Graphics channel exception! status = 0xffff info32 = 0x3 = Fifo: Unknown Method Error
Mar 25 20:25:07 MBPro15 kernel[0]: 0000000b
Mar 25 20:25:07 MBPro15 kernel[0]: NVChannel(GL): Graphics channel exception! status = 0xffff info32 = 0x3 = Fifo: Unknown Method Error
Mar 25 20:25:07 MBPro15 kernel[0]: 0000000b
Mar 25 20:25:07 MBPro15 kernel[0]: NVChannel(GL): Graphics channel exception! status = 0xffff info32 = 0x3 = Fifo: Unknown Method Error
Mar 25 20:25:07 MBPro15 kernel[0]: 0000000b
Mar 25 20:25:07 MBPro15 kernel[0]: NVChannel(GL): Graphics channel exception! status = 0xffff info32 = 0x3 = Fifo: Unknown Method Error
Mar 25 20:25:07 MBPro15 kernel[0]: 0000000b
Mar 25 20:25:07 MBPro15 kernel[0]: NVChannel(GL): Graphics channel exception! status = 0xffff info32 = 0x3 = Fifo: Unknown Method Error
Mar 25 20:25:07 MBPro15 kernel[0]: 0000000b
Mar 25 20:25:07 MBPro15 kernel[0]: NVChannel(GL): Graphics channel exception! status = 0xffff info32 = 0x3 = Fifo: Unknown Method Error
Mar 25 20:25:07 MBPro15 kernel[0]: 0000000b
Mar 25 20:25:07 MBPro15 kernel[0]: NVChannel(GL): Graphics channel exception! status = 0xffff info32 = 0x3 = Fifo: Unknown Method Error
Mar 25 20:25:07 MBPro15 kernel[0]: 0000000b
Mar 25 20:25:07 MBPro15 kernel[0]: NVChannel(GL): Graphics channel exception! status = 0xffff info32 = 0x3 = Fifo: Unknown Method Error
Mar 25 20:25:07 MBPro15 kernel[0]: 0000000b
Mar 25 20:25:07 MBPro15 kernel[0]: NVChannel(GL): Graphics channel exception! status = 0xffff info32 = 0x3 = Fifo: Unknown Method Error
Mar 25 20:25:07 MBPro15 kernel[0]: 0000000b
Mar 25 20:25:07 MBPro15 kernel[0]: NVChannel(GL): Graphics channel exception! status = 0xffff info32 = 0x3 = Fifo: Unknown Method Error
Mar 25 20:25:07 MBPro15 kernel[0]: 0000000b
Mar 25 20:25:07 MBPro15 kernel[0]: NVChannel(GL): Graphics channel exception! status = 0xffff info32 = 0x3 = Fifo: Unknown Method Error
Mar 25 20:25:07 MBPro15 kernel[0]: 0000000b
Mar 25 20:25:07 MBPro15 kernel[0]: NVChannel(GL): Graphics channel exception! status = 0xffff info32 = 0x3 = Fifo: Unknown Method Error
Mar 25 20:25:07 MBPro15 kernel[0]: 0000000b
Mar 25 20:25:07 MBPro15 kernel[0]: NVChannel(GL): Graphics channel exception! status = 0xffff info32 = 0x3 = Fifo: Unknown Method Error
Mar 25 20:25:07 MBPro15 kernel[0]: 0000000b
Mar 25 20:25:07 MBPro15 kernel[0]: NVChannel(GL): Graphics channel exception! status = 0xffff info32 = 0x3 = Fifo: Unknown Method Error
Mar 25 20:25:07 MBPro15 kernel[0]: 0000000b
Mar 25 20:25:19 MBPro15 kernel[0]: 2 = 0x3 = Fifo: Unknown Method Error
Mar 25 20:25:19 MBPro15 kernel[0]: 0000000b
Mar 25 20:25:19 MBPro15 kernel[0]: NVChannel(GL): Graphics channel exception! status = 0xffff info32 = 0x3 = Fifo: Unknown Method Error
Mar 25 20:25:19 MBPro15 kernel[0]: 0000000b
Mar 25 20:25:31 MBPro15 kernel[0]: NVChannel(GL): Graphics channel timeout!
Mar 25 20:25:31 MBPro15 kernel[0]: NVChannel(GL): Graphics channel exception! status = 0xffff info32 = 0x3 = Fifo: Unknown Method Error
Mar 25 20:25:31 MBPro15 kernel[0]: 0000000b
Mar 25 20:25:43 MBPro15 kernel[0]: NVChannel(GL): Graphics channel timeout!
Mar 25 20:25:49 MBPro15 kernel[0]: NVChannel(GL): Graphics channel exception! status = 0xffff info32 = 0x3 = Fifo: Unknown Method Error
Mar 25 20:25:49 MBPro15 kernel[0]: 0000000b
Mar 25 20:26:01 MBPro15 kernel[0]: NVChannel(GL): Graphics channel timeout!
Mar 25 20:26:01 MBPro15 kernel[0]: NVChannel(GL): Graphics channel exception! status = 0xffff info32 = 0x3 = Fifo: Unknown Method Error
Mar 25 20:26:01 MBPro15 kernel[0]: 0000000b
Mar 25 20:26:13 MBPro15 kernel[0]: NVChannel(GL): Graphics channel timeout!
Mar 25 20:26:13 MBPro15 kernel[0]: NVChannel(GL): Graphics channel exception! status = 0xffff info32 = 0x3 = Fifo: Unknown Method Error
Mar 25 20:26:13 MBPro15 kernel[0]: 0000000b
Mar 25 20:26:13 MBPro15 kernel[0]: NVChannel(GL): Graphics channel exception! status = 0xffff info32 = 0x3 = Fifo: Unknown Method Error
Mar 25 20:26:13 MBPro15 kernel[0]: 0000000b
Mar 25 20:26:37 MBPro15 kernel[0]: NVChannel(GL): Graphics channel timeout!
Mar 25 20:26:37 MBPro15 kernel[0]: NVChannel(GL): Graphics channel exception! status = 0xffff info32 = 0x3 = Fifo: Unknown Method Error
Mar 25 20:26:37 MBPro15 kernel[0]: 0000000b
Mar 25 20:26:49 MBPro15 kernel[0]: NVChannel(GL): Graphics channel timeout!