When i preview my video in the time line i have all the mask and text just the way i want them. The transitions are smooth and it looks great. When i export the video I get jerky transitions with momentary flashes of a masks that are not the one selected. Most notably a soft edge that extends up into the image or video. Some times the mask is not even the one I selected. Each shot has a mask and a text section. The text is on top of the mask creating a subtitle effect.
I have toyed with the export settings a bit to see if that changes it but i still get random masks and flashes of a soft edge mask on most of my shots.
I am using Shotcut V18.01.02
Model - Windows 7 64 bit
Processor - Intel Core i7-4810MQ CPU @2.80GHz 2.80 GHz
Memory(RAM) 16.0 GB (15.6 GB usable)