Hi Ralf!
I had this issue previously and finally narrowed down the culprit. I don’t have an HMD at the moment, since i’m waiting for a new one, and have not used VorpX in weeks. And i forgot about the issue, because it didn’t happen lately.
Today i decided to look up something in the help, and started VorpX. Suddenly, my mouse acceleration was enabled again (i always disable mouse acceleration, because i can’t stand the non-linearity).
Why does this happen? Is there any way to fix it? Any workaround?