After doing mucho experimentation today I came to the conclusion that I can't run Logic up past around 1.8 gbs of ram without getting the error message. Forget closing a project and then loading in another one as the memory doesn't seem to get purged and then it loads in another project and the ram usage gets boosted. I could get rid of the message if I froze on exs grand piano, or, deleted omnisphere, which was actually muted and only had one instrument loaded, or deleting the 3 play instances which where running some strings. Either way, I had to lower the ram usage to under 1.7. Who here is running logic 9 and has the ram up past 2 gbs no problem? As far as I know I should be able to get up to 4 gigs.
I also opened up the project in L8 without issue, but, I know L8 has a lower ram footprint.
Finally, flex audio is turned off and I'm using native plugins and uad2 plugins, cpu meter way down.