Nothing will save in Soundtrack Pro

Hallo. using fcp 7, Stp 3.0.1

Did the normal things 'send to' stp from fcp ... did the simple noise reductions, hit Save, and "The document 'xxx.stap' could not be saved.

I've 'saved as' I've used different names for the file, I'm just trying to save in the most basic way possible, and it's not doing it.

I also tried putting the original .stap file in the trash and then saving, and that won't save either, and then of course my fcp sequence has no audio.

Not trying to do the entire film, just one clip.

I'm pretty frustrated. so close to being done, and ye-olde 'save' function in Soundtrack Pro will. not. work.

any help out there?

thanks.