Okay, here is an error that I manage to get occasionally, no real pattern that I can notice.I don't have any filters, Response.Write(), HttpModules or trace enabled. (At least, none that writes to the outgoing string). The issue is that sometimes, the return result of an Update Panel postback would return the whole page, instead of just the parts inside an update panel. It is as if it decides to simply ignore the update panel, and just go its merry way onward.
Anyone has run into this before?