This bug has just bitten me again today (missed an action to get my niece a birthday card) :-(
I reported this to the 'support ninjas' some months back, highlighting the fact that 'sleeping' the computer was involved. Any further news on being able to reproduce/fix?
If you have a laptop, forget it - you have to restart the app once a day just to make sure you aren't missing anything.
Having to remember this is really not good GTD practice :)
Now that the new version is out, and ready for Leopard, any chance we can get this bug fixed???