Soundtrack Pro 3, spinning wheel

Unfortunately there doesn't seem to be a way to edit the above question altho i have new info. (How inefficient Apple!) Please see below.

I am sending/exporting a single audio (dialogue) file to STPv3 from FCPv7 in order to reduce the background/room noise level. I usually do this by selecting a region of pure room noise and using the 'Set noise' function. However although i can happily select a region of audio (dialogue) if i try to select a region of low level 'noise' I get the spinning wheel of doom for a couple of mins.

This renders the program entirely unusable and only recently (randomly?) started happening. I'm not aware of doing anything differently and been using this same set-up for years.

This seems to happen on all my audio files so not just one corrupt file.

However it only happens on the audio from camera A (Canon 7D) and NOT camera B (Canon ***).

No problem with audio from a different source Marantz or Zoom recorders)

If I re-save file (from .stap to .wav) = exactly same problem.

If i compress the whole track to raise entire levels = same problem.

I've done all the usual like rebooting machine and reloading everything.

Im totally foxed and any pointers gratefully received. I have a deadline and tearing hair out!

Thanks

Andy

MacPro 12-core, Mavericks (10.9.4) FCP 7, STP 3

Ahhhh..... Thanks Apple, so kind.

Why won't there be an update/ fix? How do you know this please?