
I haven't used Makemkv in awhile since I bought the "other" app -- big mistake. Ripping with ImgBurn to an ISO then to mkv is my usual procedure, it's a bit easier on the ripping player.
Back to Makemkv to create alternate MKVs solved the sync problem. Wow! Sync problem gone! It may be on a case-to-case basis, but I'm sticking with Makemkv until I see/hear otherwise!