I have had this same problem. It usually happens when I sit at a Stars table after having left the Table Manager window open after a previous session. The HUD does not load and usually results in a crash for HM. After reloading HM everything works fine.
The last time this happened I lost a preference file and had to re-position the stat boxes on my HUD.
I have also had this issue, and after restarting HEM the HUD does nothing at all - no error messages, no nothing. I just hit start import, and then relaunch hud, and it completely ignores me.
The import works fine, as far as I can tell, it's just the HUD that's misbehaving. I also had the issue where it would lose the table pref file, but deleting it and having it make a new one seemed to have fixed that.
Also, every couple hours or so while running it pops up that error message again, even though the hud isn't on (only the auto-import running, and the hud not working though I tried to load it). I'm making a log file to email you. It also pops up the message again whenever I start a new table.
I'm still having this problem and waiting on a solution. Resetting the computer makes it go away, but it always comes back after awhile. Also I'm still getting the issue where every now and then it loses my table preferences file and I need to move all the stats back to where I like them.