Hi, same problem for me: empty status page with my 2 s9 from january batch both (on stratum.antpool.com, for bch).
1. I tried firmware update: problem not solved
2. Then i tried ip v4 only on my cable modem:  problem not solved
3. Then i switch my pool #0 from antpool to viabtc: problem solved, after waiting a few minutes (<10?)

So my conclusion is that it's an antpool problem not a s9 miner problem.

The remaining antpool on my pool conf #1 and #2 are Dead, and when running I can now see BMminer Version 2.0.0 on the system overview page.