duplicate dashboard dialogs (duplicate)

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I've been playing around with concrete5 for a bit, though i'm still pretty new to it. I've installed it a bunch of different times, to try different things. Last week I installed 5.6.3.1 to start a new experiment - and for some reason, when I'm on the dashboard, any dialog that I launch is displayed TWICE!! I don't know if it was always like this, and I just didn't notice, or if I did something that caused this.

Does this sound like something familiar? that I should be concerned about?

-- got the spinny wheel of death & couldn't tell that it had already posted :(

ssdscott