I updated my firmware to 1.8b5 yesterday (one of my Macs is running Snow Leopard) and I'm having difficulty saving from certain applications.
I can save a new pages/numbers/keynote file to a share, make changes and save over-and-over. However, if I close the app and re-open the document, I cannot save the file (I can use "Save As" to the same directory but not to the same file).
This behaviour occurs on Leopard (10.5.

and Snow Leopard (10.6.1).
I suspected this had something to do with file locking (it doesn't occur with simpler apps like TextEdit) and disabled oplocks but that didn't resolve the issue.
I checked all file permissions and everything's fine. I can save to shares on my linux box without issue.
Does anyone have any ideas? I'm thinking that this is a locking bug w/ 1.8b5 but perhaps someone has a better idea?