Not entirely, I turned the taint log off and still had issues until I narrowed down my crash issue to modifying a custom gametooltip (like used for tooltip scanning). I eliminated the modifications as well as the :GetRegion() calls on the custom tooltip and only then did the crashes stop.
And I still crash on a /reload occasionally with the taint log off.
You can add WorldFrame:GetChildren() to the list of things that hard crash the beta client (build 15882)
(typical for nameplate addons looking for nameplates)
Note: Pulled these posts from MoP beta topic as they're no longer MoP specific. - Haleth