I am having this problem too! Emailed Gateway about it. Rolled back to 2.0b2 to check (I know it's dangerous!) and that continues to work fine. Wish I could peek at Gateway's log file. Might give some clues!
there isn't a real facebook page for gateway, just idiots wanting to feel specialError 00000019 too.. I've sent GW an email and a facebook message so now we will have to wait and see..
this is the email i got today "Thanks for feedback. Our tech team is looking into this right now and we will
get back to you ASAP with a solution.
If you could, you can send pictures of front and back of your red card, and let
us know where and when you purchased the card."
i bought my card from mod chips direct which is on their site.
Im still running the OPB try that first because thats the version thats tested most. With no further issues

i am going to guess omega private betaOPB? mind to explain a bit more please?
or you could of got the old motherboard unbricked....am having the same problem, after a hang update, i try to load game, it load nothing...
try to rollback by installing previous gateway 2.0b2, then my 3ds got bricked... blue screen of death....
bring my beloved 3DS to the most advanced gameshop in town, only one solution from them.... change the board with new one.... (about 30% of the new 3DS price), goodbye gateway.. now my 3DS is ver 7....