Hi mstoss, welcome to the forum!
what version of TW3 do you use? we recommend you to install the latest version of Tourweaver 3.00, which can be downlaoded at http://www.easypano.com/download_tw300.html .
As to the preview issue, I think it deals with the flash player installed on your computer, please uninstall all of flash players and reinstall, the latest flash player can be downlaoded http://get.adobe.com/flashplayer/ .
The Virtual Tour Way