Don't know how pertinent this is but I just hit this bug. Haven't played MEA since I built my new computer, but the last three playthroughs I always went to Havarl first then Voeld. This time (don't know why) I went to Voeld, then went to Kadara, then finally got around to Havarl, and now I can't leave.
Tried the workarounds, completed all of the available quests, jumped off Mithrava to force a respawn but still can't leave. And yes, this is the result of shoddy programming on the part of Bioware, and EA not giving a tinkers damn about their customers.
2 hours later UPDATE:
I just went back to an earlier save (lost 30 hours of game play). Went to Havarl before going to Voeld and was able to leave Havarl with no problem. This is very unacceptable programming.