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Once dismissed, this alert often pops up a second time, then, when it’s dismissed that second time (or sometimes the first time), the user interface box appears but as nothing but a totally gray empty UI window! Not a single UI widget of any kind in it, not even an [Ok] nor [Cancel] button! There is the standard Windows close icon in the upper right corner, which fortunately does dismiss the dialog, otherwise we’d have to force-quit DW itself every time this happened.
Similar errors happen with many of the WebAssist extensions we purchased as the Super Suite (latest version). It's pretty much unusable.
I deleted the winfilecache.dat file and made the change you gave in Post #2 in this thread.