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If you have installed Logic 9.1 and try to use the AU-Manager to scan all plugs new or after resetting the cache, the 64-bit Logic9.1 had problems to validate the 32-bit-plugs, so I changed to 32-bit-mode and scanned it again, then it works fine. After it I switched again to 64-bit-Mode and then all 32-bit-Plugs were validated successfully without a new rescan.
So now it would be good to have the 64-bit AU-Version of Vienna Instruments as well as VE-Pro. Sometimes it is good to use just VI-Engine for small arrangements, so VIENNA TEAM please follow Apple with a 64-bit VI Engine without VE-Pro.
The Vienna Symphonic Tool you can use just in 32-bit-mode-Logic is the performance tool for Horizon and Pro-Series of EXS24, nothing more, everything else after releasing new VI-Engine works fine through 32-bit-AU-bridge..
Nico.