My issue is very similar to this but it deals with viewport switching (via the control+shift+arrow combinations). I see the expected workspace flicker on screen, then disappear, then the sliding animation happens. See the vid. This behavior happened after a compiz update to van vugt's PPA (quite a long time ago, don't remember which vv version).
Should this be a new report, Mr. Vugt? It almost seems like the root cause could be the same.