Ships getting "stuck" when on escort missions.

[Webbco]

My manually designed escorts and frigates are "stuck" in deep space when on a mission to escort a civilian ship.

Their engine exhausts are fully lit up so it's not stationary. Just stuck.

Anyone else getting this issue?

Edit: For devs - Ackdarian, Republic.

[elliotg]

When you say stuck, you mean that they're not moving at all? What speed do they show in the Selection Panel?

[Webbco]

It says the speed is 0. I have a saved game if you want to see it elliot? 

When fuel drops to a certain level, it suddenly engages with it's next mission to refuel and starts to move again.