[curt.clifton]

You'll get faster technical help by using Help → Send Feedback to send requests directly to Omni.

That said, have you tried rebooting before launching OF 1.7.5? Reading the log you posted, it appears that there is already a server running at the same address that OF wants to use. I wonder if that might be the OF 1.5 server. Rebooting would make sure the old one (or any other one that wasn't auto-launched) was shut down.

Cheers,

Curt