Pushed back in the Horizon 787-9. Ground rquipment cleared (GSX). Went to taxi, speed was increasing but I wasn't moving. In fact I got up to take off speed according to the speed tape (see image below) but I wasn't moving. Any ideas?

Image: https://imgur.com/m2H3iJq

Accidentally engaged Active Pause?

3 minutes ago, Dazzlercee23 said:

Accidentally engaged Active Pause?

I’d not considered this but not sure how I would have done that. Just restarted flight and everything ok now. 

I had this issue a couple of times. Tapping the brake pedals fixed it for me. I don't know why it happens as it only occurs after push back had completed and had used the handbrake as requested by the tug. Releasing the handbrake would not release the brakes..

No that's not the issue with the brakes, in that case the speed won't go up on the tape.

Here's what's going on: Sometimes MSFS live weather has a severe bug where absurd wind speeds are injected on the ground (like 200 kts). I think it's caused by faulty METARs (e.g. when no wind indication is given at all) because it only happens on airports or on the approach. Anyway those windspeeds mean you simply won't be able to move your aircraft forward. At all. But the speed on the tape rises because the pitot tube measures the incoming wind and thinks you are flying with 200 kts. (I don't think that's what happens in real life, but it's a bit hard to proof unless you try to taxi into a tornado...).

Source: Happened to me a week ago in the 737 at an US airport. METAR gave no wind indication, so MSFS somehow took some other numbers from the metar and gave 200 kts of wind.

Solution: Turn off live weather until you are up in the air.

38 minutes ago, Fiorentoni said:

No that's not the issue with the brakes, in that case the speed won't go up on the tape.

Here's what's going on: Sometimes MSFS live weather has a severe bug where absurd wind speeds are injected on the ground (like 200 kts). I think it's caused by faulty METARs (e.g. when no wind indication is given at all) because it only happens on airports or on the approach. Anyway those windspeeds mean you simply won't be able to move your aircraft forward. At all. But the speed on the tape rises because the pitot tube measures the incoming wind and thinks you are flying with 200 kts. (I don't think that's what happens in real life, but it's a bit hard to proof unless you try to taxi into a tornado...).

Source: Happened to me a week ago in the 737 at an US airport. METAR gave no wind indication, so MSFS somehow took some other numbers from the metar and gave 200 kts of wind.

Solution: Turn off live weather until you are up in the air.

I don't think this was the case here because as I throttled up, the speed went up. As I throttled down (and applied brakes, even though I wasn't moving), the speed decreased.

4 hours ago, BWBriscoe said:

I don't think this was the case here because as I throttled up, the speed went up. As I throttled down (and applied brakes, even though I wasn't moving), the speed decreased.

Yes, that's exactly what I was saying. Had the same thing happen to me and it went away once I turned off live weather (200 kts wind, just look at the windsock, they'll be 90 degrees straight).
I'm not saying it makes sense physically (no idea how IAS is measured in MSFS), but that is what causes the issue. As weird as it is 🙂

48 minutes ago, Fiorentoni said:

Yes, that's exactly what I was saying. Had the same thing happen to me and it went away once I turned off live weather (200 kts wind, just look at the windsock, they'll be 90 degrees straight).
I'm not saying it makes sense physically (no idea how IAS is measured in MSFS), but that is what causes the issue. As weird as it is 🙂

But surely I'd get the high speed without thrust? When I took thrust away and applied the brakes, the aircracft speed tape went back down to 0 knots.