Cannot show the shadow on the floor

After the teamwork via revit server,I recognized that the Enscape cannot show the shadow on the floor and the screen is flashing.

Please tell me how to solve the problem,thx.
error5.gif

You are maybe using an outdated preview version. If so, update to the newest preview or the official release.

Thomas: I am having the same problem with shadows casting incorrectly/not casting in the student version that I installed last week. Thoughts?

Regarding this issue, please look at my previous post. Whats your version number? Student license does not make any difference.