simulating fleet problem

[Rusty_Nail]

I have run into the following problem in all my recent games, though some earlier games worked fine. In simulation mode, when I create a fleet and try to add ships ("add all" or individual click on a ship) the fleet logo disappears! No fleet is created. This is rather frustrating because I cannot simulate fleet strategies anymore. Has anyone else experienced this? I wonder why it used to work, but does no more!
A second problem I have is how to simulate a ship attacking a sector with mines or satellites, e.g. a planet or a warp point. Is there a way to do this? They don't seem to be on my selection list with planets, warp points and ships for some reason, nor can they be added as "cargo". Any help would be appreciated.