muzikman, please understand the 3D software you are using is in BETA stage, it's not always going to work for everyone and on every machine. We are aware of bugs and are working on them daily. Let me see if there is a most recent beta, but you can help us by letting us know some details about your system so we can maybe help pin point the issue and fix it ASAP.
what OS are you on? what version?
did you do a clean uninstall and re-install of the Beta just to be sure? Confirm your openGL version is 3.1 or higher? Prrhaps there's a problem in 3.1 that we need to look at.
Please let me know and we will try to get some fixes up for you all to test. Thanks!