I continue to get this error. Could one of the Adobe employees on the board provide some insight?
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Have the same issue. Did all the previous work in 4.1 or thereabouts. Opened in 4.5 pro and every code view wants to load design view and you get a spinner timeout before you see the dialog alert. And it take clicking somewhere else to tame it until the next time.
[Update] Found Window -> Enable Design Mode did the trick. Uncheck the menu choice.
This certainly helps. Thank you.
I would, however, like to know why this is occuring. I often use DesignMode and it seems counterintuitive that an upgrade to the Flex architecture would actually result in a slower design mode view. Can an Adobe employee offer insight?