I am currently playing on the most recent build of DL and this is only a recent problem.
Every few re-loads I find I can not move my ships! Needless to say, this can ruin some of my more "delicate" manuvers. The message on my screen say that my ships are out of range of the nearest planet/star base.
This is an infrequent problem, but a problem none the less, so the next time I this occurs I will post a de-bug.