On Flash CS4, when I am trying to save a file -- even a newly-created file -- I am now getting the same message every time: "An unknown error occurred while accessing/ (file name)"

Basically, I can't save a Flash file at all. But I can export files that I have opened as SWM or MOV.

I updated my OS just recently. Did this have anything to do with it? Before that, I never had any troubles.

Please help!