1. In saved game Hraztav IV isn't blockaded, I noticed you have some task forces on patrol order. Instead you want to orbit the planets to be near them for constant blockade.
Hmm. So it works _that_ way? Ok. It still bothers me, as I could observe different results with the enemies, where one ship totally blockading full 3-5 planet system... but I am not sure, and most of my systems now have full set of stations, so, well, it's for the future testing. Maybe.
2. I explain (see the support email) regarding the disrupted invasion attempt due to Tantik ship crossing sector during the turn which you can see is right above (Sector 3,45) moving downwards. I made a little change though so the order to invade isn't aborted any longer.