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I am not sure what is causing the popups but anytime this has ever happened in the past, we have always ended up figuring out that it's perfectly legitimate stuff identified incorrectly by a certain browser. You shouldn't ever have to be concerned with spyware at SMF.. we have scruples you know
I will report this just in case it has not been reported yet.
The source of this problem has been found and it is being corrected at this time.. I don't have any further details than that. It should be all better very soon