I have started getting popups like this when flipping from say Tables to Views:
Once I hit Close the RHS panel does not populate, but when I click the Refresh All Objects, everything populates with no issue. The longer I have the Beta running the more frequently messages like this appear when going from tab to tab. I am pretty sure yesterday I was getting a different message when going to the Materialized View tab.
It does not happen all the time, just occasionally.