I can see it is an old topic, but I am now experiencing the same issue... I was able to enter flash point with my smuggler, but now that I have played Jedi Councillor I am not able to enter flash point with none of my characters. get stuck at like 10% of the bar on loading screen.... Checked and I can confirm that CPU usage of SWTOR drops to 2% (unusual) and network bandwidth to 0.
Has any1 solved the issue?