Did you send the report in? I am not able to reproduce the crash, I tried on 2 systems, with multiple 3D views, plan view, 1 raytrace going, 1 raytrace queued, generating 3D views, flipping through the library, CPUs maxed, fans screaming away and nothing. If you send the report in we can look at the action report and maybe better able to determine what is going on. When you get the assertion failure, there should be a send report button, just press it and we will have an action report. How easy is that?