I have the same problem here and it only happens when performing a RTO, First time when FSX is started making a RTO all works fine but after that I can not make a RTO again the AUTOBRAKE disarm light illuminates But when landing and the autobrake is selected to 1, 2, 3 or MAX the system operates correctly. I can not figure out what is causing the RTO to fail. Same one have any idea ???!!!.

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Same for me, I can get RTO Autobrake working once per flight sim session. I posted about this many months ago and never get an answer. I believe this to be a fault with the NGX, unless someone could tell me different or what I am doing wrong.

My problem that I resolved recently was that FSUIPC had brake entry on the axis even though I had removed them in the GUI. Manually deleting them from the cfg file resolved it for me. Appears these were conflicting with the NGX somehow.

After disabling any FSUIPC settings and unpluging controlers i confirm, that using reverse during one rto will prevent any rto engagement after that, autobrake will simply disarm.

I have finally solved this, open your fsuipc.ini file and delete any reference to brake axis, it works for me now for both the NGX and MD-11. Use fsx default settings for brakes

Sadly, it didnt work, have you tried to do this as i described ? one rto with reverse, and after that another rto, at that moment autobrake disarms.