Major graphics and gameplay bug, please read!
The DSII appears to swallow half your ships and sit right in the middle of the map. Also, you can't destroy the planet because you're in the atmosphere. And even when you do destroy the planet (on the Galactic Map) the actual space tactical map still takes place in the atmosphere.
Proposed solution - Get the DSII to blow up Cloud City and let the actual planet remain with no station, as I love seeing TIE Interceptors fly through the clouds. However, please sort out the graphics glitch with the DSII. Don't like having my Executor swallowed by my own Death Star.