The good news is it seems confined to the startup scene. If you skip this straight into the game scene it starts OK (for me, anyway).
Try setting the following two items in settings.ini:
- MyDaggerfallPath = <path to game files>
- ShowOptionsAtStart = False
I probably won't delay builds this weekend for this, as vast majority of users are Windows which appears to be unaffected. We might even get the problem solved faster with more eyes on it.