Hello I am running Logic 8 on a new 21.5" Imac and 10.6.3. It does work OK in general but I have found a bug that causes me a bad issue. 1 - throw away the logic preferences files. 2 - Start Logic - All seems great. 3 - There is a feature where you can open a window that shows all the patches and allows you to choose the bank and then choose the patch in tht bank from the Patch list. 4 - To use this feature you double click on the instrument name in the arrange window. (this must be an EXTERNAL INSTRUMENT). 5 - If none of the Logic Preferences have been changed this feature will work normally and the PATCH WINDOW will pop up and stay up. 6 - Keep in mind this feature fine in Leopard 10.5.8 but after switching to OS 10.6.3 the feature become problematic in thefolllowing way. 7 - Once any of the preferences have been changed in Logic 8 ( such as changing the DISPLAY PREFERENCES for the arrange window or choosing your Audio Interface in the audio preferences of Logic 8) the POP-UP window of the Patches just flashes once then goes away. 8 - Will there be an update to take care of this issue? 9 - I had no problems in Leopard 10.5.8.