I've been playing 3.5 for about a week now. What I thought was just a serious bug is actually an intended feature according to Chris Roberts:
Ships Constellation-sized and smaller will not be able to make long jumps. That is, for example, an Avenger will not be able to jump from Crusader to ArcCorp without overheating/damaging its engines. I thought this was a bug, as when I used an Avenger, I was stopping multiple times due to an overheat warning in 3.5 while trying to travel to ArcCorp.