Here is what happens.
I do Tools > Import and make a selection, say "import a single folder" and hit next. If I wait about 10 + seconds, the box immediately behind it appears asking me for the details.
If, after selecting next, I click anywhere else on the screen during the 10 second waiting period, the current box loses focus (it turns light blue), my cursor turns into a light blue circle that keeps turning, the box gets focus back, and I can count to 20 until something happens: usually after 20 seconds the dialog box just disappears and MC is functional again and all dialog boxes are gone. However, when that happens it means the the import just went ahead without my ever doing anything on that second dialog box (because it never came up).
At other times after the 20 seconds I can get control back of the mouse but MC is locked because the dialog boxes are still open behind it. Minimizing MC and bringing it back often isn't enough, nor is alt-tabbing my way to it; I have to poke around with the View Desktop and choose MC again, or I have to minimize my other programs and at one point I may get lucky and get the dialog box.
I just did it again with only this IE window open and MC, and never did get the dialog box back; it just disappeared after the 20 seconds, and went ahead and did the import that I didn't want.
Very similar issues occur when modifying a view scheme's rules, especially when opening the smartlist editor. The OK or Save confirmation dialog box is always hidden and a bit of jigery pokery is required to get it back.
I don't run any management program and I dont' run any anti-virus program other than Microsoft Security essentials.