Me too. I was running Bitcoin ABC 0.16.1 and it got stuck on block 530361 (same on two different installations).
I've read somewhere that the network protocol changed after block 530361.
Then I downloaded the latest 17.3.0  but it still doesn't work.

However I'd need to keep 0.16.1 because - as to my knowledge - later versions don't work with Armory.

Anybody knows how to get it un-stuck from block 530361 ?