Disable a Group causes RT to Hang

I have upgraded to 3.4.2 and I am still having an issue with disabling
groups. If I disable a group, the process /usr/bin/perl
/opt/rt3/bin/mason_handler.fcgi takes all the CPU on the box and
everyone goes down. I did not see it referenced in the changelog, but
was this expected to be fixed? I have seen several people have trouble
removing people from a group, but not necessarily disabling a group (I
could have missed it).

If this is a known bug, any idea on a workaround?

Thanks for your help.

Ben Bush