It started when I set sharpness for all tracks. The mask track with chroma key stopped working and all was black. I had to delete the "blue box" and reset the chroma key plus delete the sharpness box for the mask track. Now when I try to edit the DVD menus it kills the chroma key setting and I have to put it back. I use a 4/2 arrangement of thumbnails for the menus. Now when I add a new chapter marker it creates messed up thumbnails in the menus, and deletes the new chapter marker on the timeline.

OK there are probably some bad memory references in MEP 2018. This is typical of problems where wrong memory cells are written inadvertently. It also asks multiple times to save the project which has already been saved.

The last problem I spotted in image stabilization has not been replied to, probably because it is a coding error which requires extensive fixes. I am considering after this project is done, switching to another vendor with fewer bugs.

I might consider a workaround of deleting all chapter markers and putting them back in. It is time consuming, but there are titles corresponding to each marker that make it doable.