Hello-has anyone else experienced system instability with N7? I have installed the service pack (just today). During a coding session after installation, (I had about 30 free nodes specified), the program flagged me that there was a fatal error, it was shutting down, and that any unsaved material would be lost. I didn't panic, because I had saved multiple times and very recently, yet when I reopened the program the nodes had disappeared. Any advice?