So far, to my best knowledge and firsthand experience, these fixes for the Playful Sprites error/crash DO NOT work:
- -Reseting your settings to default
-Changing your graphics quality from High to Low (or vice-versa)
-Changing your server to EU/Asia and back
-Deleting your saved emails through the battle.net launcher options (General, then underneath security)
-Adding Hearthstone to your Firewall exceptions
-Uninstalling/Reinstalling Hearthstone and the Battle.net launcher
-Deleting your Battle.net cache folder
-Deleting your Blizzard Entertainment folder from C:\ProgramData
My best assumption is that this is a server side issue, not a personal settings issue, since some threads have people logging in from different computers and still receiving the error while their friends are fine.
As far as a solution, the only one that you could genuinely count on at this time would be one provided by Blizzard, and they obviously don't have one, nor an estimate on when a solution will be available.
I don't agree with not having any updates in 5+ days considering several of the affected have already contributed their money to the game (if people are going to give you money, you should at least provide them with an update within a day or so window in order to provide a small peace of mind), so maybe creating a single thread, where the effected post and people provide information on the false fixes, would be effective in garnering a bit more attention.