Fireworks CS6 (188.8.131.524)
- create a png in Fw and save somewhere, close it.
- browse to it in Mac Finder in column view so you see the preview thumbnail
- double click (presuming pngs open in Fireworks), or right click and open in fireworks
- make some change then save
Fireworks pops an error message "The file is already open in another application" and won't save
switch to Finder and choose another file so it no longer showing the preview thumbnail
switch back to Fireworks and it will now save
Has anybody else seen this issue - is there a fix ?
Yes - a bug and I have not see a fix. Your solution is a work-around however Fireworks should fix this.
This is also a problem with Adobe Acrobat v10 - seems to be an Adobe "feature".