As it seems over here,
the krpanotools don't work with the latest version of MacOSX Lion (10.7.1)
I get an error "Fehler in der AppleEvent-routine" / "Error within the AppleEvent-routine" for every droplet on my Lion-machine.
Everything's fine with the very same files on my SnowLeopard-machine.
I'm using the current version of krpanotools-1.0.8.14-mac64-2011-09-23
- same thing for the 32bit-version