[Brian Vawter]

FLIP4MAC V3 installation caused this problem for me.

I too got the error “loading ExporterQuickTimeHost.bundle” when launching Premiere.
I encountered the problem after I had attempted to install Flip 4 Mac V3. This was the OS Lion version of F4M. The installer checked and notified me of this (my system is Snow Leopard)
I obviously didn’t update F4M but after quitting the installation I got the “loading ExporterQuickTimeHost.bundle” error and could not launch Premiere.
But I was able to solve this by going to Hard Drive/Library/Quicktime and trashing the “Flip4Mac WMV Import.component” file. I then restarted and Premiere launches again.