So once Cakewalk releases X3e, the UAD issue will be fixed, most likely with no need for UA to do anything more. This is why it's important to me that X3e comes soon - ideally before UA tries to work around the issue on their end, which could potentially conflict with Cakewalk's fixes.
Actually, Cakewalk already seems to have been aware of what was causing the issue when X3d came out, but I assume they were unable to address it quickly enough. After the first few updates came out so quickly, I was expecting that an update adressing this and other already understood problems would come out right away. It looks like they switched gears to put out the demo first - now that it's out I'm expecting X3e to arrive soon enough, I guess.
I would be even more interested to hear whether Cakewalk plans an X3f, after X3e, since there seems to be no expectation that everything will be perfect in X3e.