Getting this error in my VWD 2008 Express this morning on a web site that ran last time I opened it a few weeks ago. Page loads OK, then goes nuts on postback. Breaks in a module named script block [dynamic] multiple times. The module has a single line: downloadCanceled();. I didn't put this code in so it must be ASP.NET generated. I got *zero* hits on this search in both Bing and Google: asp.net "JavaScript runtime error: 'downloadCanceled' is undefined". So, that's pretty good. Guess I'll get at least one if this posts successfully. I'm guessing Windows Updates or some corrupted file(s) are the root cause, but I don't know what to try next.
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