Can't initialize Audio Units

Question

I've been running Komplete 6 (Kontakt, Massive, Reaktor etc.) and OmniSphere/Stylus for some time. The other day, when I started up Logic (version 9.1.1), it said "reinitializing Audio Units" and all of my softsynths are now gone from the Channel Strip insert (where I usually grab them). I went into Audio Unit Manager and rescanned manually for each one. They all validate. I've updated all of the synths from the Native and Spectrasonics websites. Any idea what gives? I'm baffled and want my sounds back. The Apple-provided synths all work fine (EVP etc.)
Thank you! I'm about to throw my head through a wall.
iMac 28 Ghz; 4G ram; Logic 9.1.1; OS 10.6.3; M-Audio Profire 610 midi box.

Answer 1

Facie wrote:
I did as you suggested and it found (re-found) and validated 38 AUs, but the same problem exists. I can't see them in the channel strip plug in like I always have. Do you think it has something to do with 64 bit v 32 bit compatability?
The rescan found Reaktor and FM8, but not Kontakt, Massive, Guitar Rig 4, OmniSphere, Stylus or Battery 3.
Are you running Logic as a 64 bit application?
If yes : then that is your issue, as not many plug ins are 64 bit, and will no longer show up in Logic.
If no : you need to do what the other poster suggested and reset the file that tells Logic what plug ins actually exist, and force it to rescan all of them.
As far as the Channel Strips, these are located in your Library/Application Support/Logic/Channel Strip Settings/
Check to see if they are still there. These are *.cst extension files.
If they are, then a Logic preference file may be corrupted.
Cheers