My Windows client is not syncing either, and I used addnodes. My other clients (BTC, LTC, FTC, FRK, WDC, BQC, etc.) all run fine.

EDIT: I addnoded every address in the first post, and it finally started to sync.

EDIT2: Now it says "WARNING: Checkpoint is too old. Wait for block chain to download, or notify developers." It looks fine otherwise, so I don't really know what the problem is.