I am on Mac OS X.2 using Fireworks MX, and get this error message fairly regularly: "Could not render the database. The file is already open in another application."

I get this when I am trying to preview an image, and am unable to find a workaround to this problem. Usually I have to quit the program; other times, I have to reboot the entire system. Any solutions or fixes to this problem? I have experienced it on two different Mac computers running the same system and software.

Thanks for any help,

Tony