Thanks for this option of a workaround, I will bear it in mind in future.
But could you please do me the favour of seeing if my Issue #2 (burning straight to the DVD) is replicable as I experienced it?
Referring to your first screen capture above, check the "Burn to disc" box and see if you can burn a DVD using the following 2 variations of "Disc Label": 1) a name with a space in it (e.g. My vacations), 2) continuous characters with a name longer than 8 characters (e.g. Myvacationsaregreat). I know your option works in this latter instance through the work around, but I want to see what happens if you go straight to disc.
Here is an update with my Issue #1 (change menu style in MyDVD): if I "Change menu style" first and then "Add new movie", there are no problems. Interestingly, it gets more complicated if I "Add new movie" first, then try to "change menu style": if I add one movie, the change menu style takes (say 30 seconds), if I add 2 movies, it takes a lot longer, and then if I add 3 movies it takes even longer. In both of the latter 2 instances, the application gives the "not responding" response and looks like it has hung. But if you wait long enough (??) it does complete the change menu style.