After boarding and taking over some pirate ships at a planet then moving my fleet out, the galaxy map still showed a couple of pirate ships at the planet but there were none.

I had some stuttering in a late game moving a large fleet, but not together.  When I clicked on the command ship of the fleet and clicked on the destination again, the stuttering went away.  They were moving to my star, I click to send fleet to star first.  Then when the stuttering began, I clicked the fleet and specified a location in the star's gravity well and the stuttering stopped.

I had a starbase at a planet and I constructed the repair booms on it.  When I tried to build a repair station in the gravity well also, I could place it but no construction ship would build it.  When I tried to specifically tell a constructor to build it, it would say something about it, text wise that I cannot remember, and would not go to it and construct it.

I could not research Liberated Resistance tech.  I could select it and it would put the mark like it was queued up to research but it would not.  It was the only tech left to research, none others were running.

Thanks.