Currently on test.wiki or mediawiki.org if you try to load the VisualEditor by switching to it, it fails with the error message:
"this.getSurface(...) is undefined"
The trace points to ve.ui.Toolbar.js (line 224, col 8):
return this.getSurface().triggerListener.getCommands();
Running in beta mode as a logged in user. Couldn't test on Beta Labs due to Parsiod issues there.