For future reference, never ever ever take a plane up unless you are 100% sure everything is working right. I remember the itch to get in the air as a newbie too, but it's not worth it. I'd say call tech support and ask about it. It may well be part of the ACT device's programming to save you from making bad pilot errors, but you need to know that for sure. If it turns out to be a defect in the system, it's likely to get worse rather than get better.