I have never been able to reproduce this issue here and I don't have enough info to make it happen. 2 users have been affected, one of them because he was naming its list 'Remote Lists'. I had no confirmation from the other user since I asked him to give me info to reproduce the problem here. I will make a modification to MaxBulk Mailer to forbid naming lists that way.
I can't fix a problem if I can't reproduce it here. Bug reporting is explained
here.
Believe me, it takes minutes to fix a bug as soon as I can reproduce it here.