I've been testing R7.0.1 now for several days, and in that time I had 3 NSD's and one red box. I can't say I really put it under pressure, but this is somewhat disappointing. The red box was in the Admin client, so that could be due to the fact that I've dragged my Workspace all the way from an R4 system to now R7. I would have imagined that by now there were no NULL LookupHandles left, but they still exist.
What's your experience, how's Notes/Designer/Admin/Domino behaving?