Taking in fact that 1 vote= 2 golds... i don't find any big loss cause of that rollback, few people(like me) farmed cards in that hour when we worked after nh patch, and i got rolled back to no cards..so..i guess donating it's safe as far as all people got their golds o.o even me. Idk, it's up to you if u donate or not. But i don't believe u will lose any of your donation.
People donate all the time. Donating (As far as the page goes) is automatic now, and happens within 15 minutes of donating. If you're really skeptical about it, just donate a small amount (1$) and see if you receive it. If you do, donate more. Though, I'm sure there isn't a problem with receiving gold at this moment.
I was think about donating (cuz i have no life be on this game) but I kind of semi afriad because i voted 2 days ago then there was a rollback and THENNN i lost all my gold :> so....wtf....when the gold coming back o-e