PG Music support verified an issue with 3/4 (waltz) UserTracks earlier this year. A fix has not been released so it will be difficult for anyone to create a waltz UserTracks that works.
The issues were first noted by Radipoet March 25 in a posting titled "Tried to make a waltz ..." in the UserTracks and add-ons section.
The issues were described as timing and missing measures.
I can not post a link to the posting as I'm on a tablet.
Glad you told us, I had planned for my next stab at a UT would be a waltz. So it looks like I'll skip over that one and rethink my plans for other project to work on. Out of curiosity, can you recall what sort of "issues" they were running into with waltzes in particular?
Thanks for providing that whole correspondence, which obviously went on long before I came to this forum. This also all took place before the latest Mac update was released, so maybe I'll have a stab at it after all