ok. i can reliably repro this issue - "CMD+C" gives an instant crash.
If I went into the file menu and hit Edit -> Copy - that works fine without a crash.
I use "Paste" clipboard manager. If I quit that app entirely, the crash goes away. Reading what is above in this thread - it appears to be the same crash above with a different specific helper tool.
I have an example file which repro's this behavior - as well as the crash stack if you need it. It has an embeded image in the document which also seems to be a common denominator.
I can also verify that this still crashes the AD Beta (1.9.0.21) - didn't grab the crash stack on the regular app, but I did get the one off the beta - and it's essentially the same.
AD Crash on CMD+C with embedded doc.rtf
I can do all things, banner image, small.afdesign