BTW. Loving the new features in 6.7Dev1. I know it is naughty, but I am using it for some real work... Appears to be totally stable and the regular features all seem to work. Incredible.
I am backing up more frequently though...
Ha!!! So I found out a few hours ago. No harm done though.
Apart from that, I had it running for about 4 days, worked on it for about 15 hours total, had about 4 tasklists open, added up to 500 tasks (rejig to my year plan), applied a few filters, etc, etc, and it didn't miss a beat. It crashed when I was showing someone the task shortcut feature. Haven't tried to reproduce.
The only minor annoyance was the bug I have mentioned a few times, where the start and due dates don't show in the grid for a new task created from the completion of a recurring task (but do show in the edit bar).