I've had problems with 51713, I uninstalled it and went backwards too. My problem was sluggishness in moving anything. A little message pops up in the left corner that wasn't there before too, it says "global transformation" when importing a pz3, have no idea what that means.. I'm using an Nvidia 9800GT
I've raised yet another ticket on this slowness, I'm getting a bit fed up that they keep releasing new versions every few months when they can't even sort out what they have properly..

Injustice will be avenged.
Cofiwch Dryweryn.