On Movie Studio 15 when I apply a "Video Event fx" to clips part of the image (a large rectangular patch on right hand side at midheight) is always left unchanged. MS 15 is therefore unusable! Applies to all fx types I have tried and all clips (generally avchd clips). Working on Win 10 PC 64 bit.
Repeat with same clips in Movie Studio 14 there is NO PROBLEM. I want a solution or my upgrade refunded.