This is not an error that I'm familiar with or have experienced myself. If you have searched around here on the forums and cannot find anything you may want to try hitting up the developer forums on Adobe's site or if there are any general DW forums that they have.
You could also try the DW cache file or configuration folder to see if that solves the problem but I'm not sure if that would do anything for you or not. Here is a link to a page with the steps to take for these techniques.
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