virtualbox.org

I have encountered a 3D Acceleration problem with 4.2.12 that did not exist in previous versions. I was considering reverting back to 4.2.10 or 4.2.8 to verify that this is a regression issue. However, I've seen mixed opinions on the feasibility of such a action.

Does anyone know with certainty if it is possible to revert to a previous version WITHOUT risking corruption of existing VMs?

Normally, there are only bug fixes changes between such minor version, so there shouldn't be any compatilbity issues AFAIK.
Regardless, be sure you backup your data before attempting anything like this!