How do I fix opendiff?

I just remembered FileMerge comes with Dev Tools so I'm posting this here along with the generic question I posted in the Leopard Forum.

I also found out Opendiff is the one in charge of launching FileMerge and it works fine from DreamWeaver. But when I use the "Compare Files" service, i.e. the contextual menu option, FileMerge opens but the open window sits there with its fields empty, and I can't drag the files in because the finder script is still running and won't let me do a thing until I hit escape key.

I installed Developer Tools time ago to get FileMerge but I always used it manually. This is the first time that I actually went to DreamWeaver and set it up correctly. It works fine from DW, though. It's the Finder Service which won't find the files selected in Finder.

How do I fix opendiff or whatever the OS Service uses?

Does it have anything to do with the other issue in which Chrome won't find the files when opened from DW? i.e. DW Uses no "Volume" before the Partition name.

Thanks.