only the "normal" Logic trouble here, nothing new. Maybe you have problems with some of your AU Plugins....I had troubles with my Waves Plugs, they changed my colours in Logic (many shades of black and the V Bundle didnt worked right). I tried everything,like reinstall, trashing prefs, etc. Nothing helped, so i decided to make a new clean install on my Quad PPC on a second drive.
That takes a long time to install everything, that is the reason why i installed on a 2nd drive. When i had free time, i installed - and when i had to work, i switched back to the old System. After days the new system was ready, everything was installed and authorized.
Try a new Install on a fresh Drive, and make a smooth change from one System to another.
...only my little hint and maybe it helps you
Greetings from Berlin, Mathias