I am having the same issue when trying to send to "Registered" group. I submit and the page goes blank. As far as I know the PM wasn't received by any users.
I can send to all other groups with no problem.
The only thing I see different with that "Registered" group is that it's the only "primary" group on the Usergroup page in Admin. The rest are secondary, and the mass pm work with those secondary groups just fine. Dunno if that means diddly or not, but thought I would throw it out there. Heh.
If anyone can figure this one out I will be most grateful. Thanks!
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