Ah HA!
This problem has bugged me for ages and I could never find it. I too
worked around it with re-saves or forcing nib recompilation whenever
one of them worked. I always blamed some obscure corruption in IB but
since I'm stuck on 10.5 I assumed it was just something to live with.
I've had this problem show up sporadically for some time, but now I can't get
rid of it.
I have an NSOutlineView with several columns, two of which have checkbox
behaviour. In these columns I set a NSButtonCell in IB having the checkbox
behaviour, and in fact I want to have custom images
OK, I think I found the reason for the problem.
I'm using the generally excellent BWToolkit in my app, but it has some issues.
One of these is that the version I'm using completely breaks nib decoding by
brute-force switching out the standard NSButtonCell class for the unarchiver.
That's just
