Hey guys.. regarding that bug with sequence breaks that disappear in unused sequences if you save and then load a tune.. Try this version and see if it fixes your problems:
http://toolsforscholars.com/defmon-20171024.zip (EDIT: Use the link in the next post instead. This one will be removed.)
I did some changes to the worktune (un)packer code. If it works as intended, these changes to the code will not only avoid the problem in the future, but will also fix tunes with missing sequence breaks that were created in previous versions. Just go ahead and load your broken tunes in this version of defMON and see if they are magically healed. If it works, we can add it as a new version to the defMON wiki.
A word of caution: I didn't have time to test these changes to the code very thoroughly, so please save some backup version of your tunes before trying this version of defMON, in case the added code messes something up.
@Ett nytt liv: Good to see new defMON users. I think your problem relates to the missing sequence breaks (red dots). Looks like those were missing in all three sequences precisely at the place where defMON started behaving weirdly in your video.