Can remodeling work around a window cause moisture / condensation problems?
Did the flashing repair involve removing/re-positioning the exterior trim/siding/sheathing?  

If so, the simplest scenario might be due to the insulation being disturbed/removed.

You can check on the inside by moving a burning incense stick around the trim and window, which should reveal air movement.  If you find a "windy" area, remove the interior trim and add low E foam (low expansion) if there are any air leaks.