I'm not sure whether its just me, but I think the dynamic 3d view performance is extremely poor in this build. If I pick the eye ball icon from the top toolbar, & spin the model everything seems as is should, however, if I use shift & middle mouse button, performance is extremely poor, to the point that its unusable; this didn't seem to happen in the intial build. This is on a Dell M70 laptop, 256mb graphics, opengl enabled only, 2 gig ram. The model is only 24mb. I'm fortunate to have Revit Structure 3 on my laptop as well & I haven't update the build yet;so I opened the model in Revit Structure 3 and model whizzs around in 3d using the shift & middle mouse button as I would expect. Anybody else noticed this?