"Out of disk space" dialog keeps coming back
I got this message so I removed a whole bunch of files on this external USB drive
Now that I have 27GB free I pressed continue, but this same dialog returns after about 1 second. Pressing on "Stop writing files" does the same. I'm a bit worried about force-quiting the app but I don't seem to have any choice. Is this a known bug?
MacBook Pro (15-inch Core 2 Duo), Mac OS X (10.7.4)