After some time, I think after saving some files and waiting a couple hours, Fireworks CS6 says, when exporting somewhere
File couldn't be saved.
The file couldn't be found.
(My translation from German) Why should it be found? I didn't wanted to open it. Just export it.
This issue wasn't before I upgraded to OS X 10.8. Is it a knowen bug and is there something I can do to get rid of it?