Basically every export I've made with either Videopad or its cousin Photostage has noticeable artifacts that are not in the source files. I suspect some may be related to things like text overlays and effects, as there seems to be residual bits of those showing on later frames in some cases, but that's just a guess, and there seems to be some apparent randomness to it, like not every single export artifacts in exactly the same ways or places, even though the export settings and most of the sequence remain the same.
Anyway, is there any way to get a clean result when exporting? It's aggravating going from a pristine image to distorted blotches showing on what should be a clean, single-color section of a frame.
For reference, I've mainly been using mp4 lately as the export format, though sometimes I've used AVI then converted to mp4 with other software. Almost a year ago I tried a bunch of different export options on a different project than the one I'm working on now, and nothing seemed to fix the artifacting, so I gave up, but figured it doesn't hurt to ask before I upload the next one, just in case someone knows how to fix this ongoing problem.