Weird, when wheat was limit up it still showed quotes. Then again I only looked during the overnight session, maybe the day session is different? I'm showing a few random trades between 1393 and 1400 (using IB prices) but I'm not showing bid or ask right now.
I thought this kind of crap was behind us now that they moved everything to GLOBEX. CBOT, why can't you keep trading up when every other exchange can?????