Yes, I tried a simple project where I just sung the numbers from one to six, on 1 track with no other FX and the timing was still off. I made a little video of it and sent it to Celemony via DropBox but they haven't responded that they've seen it.
In the meantime, I just loaded Melodyne Studio 4 "trial" onto my backup DJ laptop (win10, i5) and have a "Demo" version of an earlier version of Platinum on it and was surprised that the timing was just fine. For the test, I dragged Queen's Bohemian Rhapsody (MP3) onto a track, loaded Studio 4 as a plug-in, transferred the first a-capella 40 seconds of the song, and wow! Studio automatically chose the polyphonic setting, then broke it into the single vocal parts and it played in sync. I was even able to delete some notes to hear just the root melody that seems to be in the key of "G". On this computer, I never installed Cubase and maybe that further points to the Cubase ASIO "generic low latecny driver" as the culprit. It was really nice to be able to break apart the individual vocal parts of Queen's legendary song. Who would-a thunk even a few years ago that this ability would be possible? Amazing.
If I reinstall windows and all of my programs on my desktop, that's about a 2 to 3 day task. ugh... but if that is what will make it work, I'll do it because the reward is worth it...