I just tried reinstalling BCC from scratch but this time, I selected CS4 and Custom Install at the same time.
The CS4 installer always put the BCC plugins in the Application/AE CS4/plugins folder for me, not the MediaCore.
So I selected the Mediacore folder as destination for the Custom Install and the only message I got when opening AE CS4 was that I had duplicates plugins … but the BCCs loaded just fine !
I then quit AE, deleted the plugins in the App/AE/plugins folder (keeping the ones in MediaCore) and restarted AE and they seem to be working fine. (did 2 test exports)
m.