Have you tried this block chain: xna_blockchain_12410.zip?

As I stated slightly earlier, I submitted a pull request that had the unfortunate side-effect of breaking blockchain syncing if you are below block 2500. You can try the above blockchain or download the 2.1.2.0 wallet, sync up to block 2500, then run the new 2.3.0.0 wallet to sync the rest of the blockchain from scratch.

I'm sorry to have caused you (and everyone else) this trouble.