I'm on Emacs 23.0.60.2, and I haven't seen anything like this. Could you be a little more specific, so I can run tests? Are you saying that you have text in a .arc buffer, you kill it, and you can't yank it into other buffers?
No, I'm simply selecting text with the mouse in an Arc buffer and trying to paste with the middle-button in a non-emacs window such as this text area.
I've narrowed the problem down to the filename extension. Here's the test:
brian@airstream:~/temp$ cat > temp.arc
hello, world
<ctrl>-d
emacs temp.arc
Then select some text with the mouse and try and paste in a non-emacs window using the middle button. I can do this with everything but files ending in .arc !
brian@airstream:~/temp$ emacs --version
GNU Emacs 23.0.60.2
I just killed my .emacs file as a test and I get the same results, so you should be able to duplicate that if you're on Linux.
With no .emacs file, I see the following message when loading temp.arc:
File mode specification error: (error "Buffer format not recognized")
I expect that's related. Maybe we can get pg to use another extension like .arclisp :)
So it's not sufficient to add the new arc.el, you have to remove the existing association also? I would think that once a match is found in the auto-mode-alist, it wouldn't consider the other entries.
BTW I started a thread on gnu.emacs.help, but if the above fixes it, it's moot.