It has now been over a month that I have not been able to open hearthstone. Every time I try opening I just get the same HS:NGRESULT DB ERROR:303:0 Error. Support won’t help, everytime I do what you guys say in these forums they just ignore me. I dont know what to do at this point other than make a fraud claim with my bank. You guys have taken my money, locked me out of my account, and ignored me.
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found this on an old thread.
Had the same problem after SoU update. By looking at Hearthstone logs I saw that cache folder was causing problems. If you have same problems try cuting folder Cache from C:\Users\yourname\AppData\Local\Blizzard\Hearthstone and passing it on desktop. After that try to lunch battle.net and the game again, if it starts just delete that folder from desktop, if not return it where you cut it from. Hope it works 
I would maybe send a support ticket to the developers and see if they can fix it.