IB ECBOT stop-limit overnight

A few days ago, I had a GTC stop-limit order on ZN which should have been triggered but did not; the tape showed we traded through my trigger price for several minutes but my order remained open the next morning. I have my stop trigger settings set to active for after hours sessions.

I believe ECBOT does not support native stops or stop-limit orders, so could this failure to trigger be due to some downtime at IB itself?
 
Go to the "configure" menu
then "order" then "stop trigger method" and make sure the "allow triggering outside regular hours" box in the lower left hand corner is checked.
 
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