Sorry to say I have this problem - a real pain. DW CS5 Ver 11.0 Build 4964 Win 7 SP1. MS Security Essentials. I never use Win Explorer, and, in any event, the preview window is turned off. I've shut down every other application and still have it. It usually pops when you try to do a Preview in Browser - it makes you save the file first - bingo - sharing violation. The only way out is to Save As with a new name, followed by an exit and file rename back to the original. I'm wondering if it has something to do with the Files sidebar - which may be either open or was just used, in which case the sharing might be within DW itself! Bob B.
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