I could use some help in fixing this bug. http://d.puremagic.com/issues/show_bug.cgi?id=6189

So if anybody who has some understanding of register handling in the
backend
could help pinpointing the point of infection for this bug, that would be
great.
If there really is not a single point of failure, comments on the proposed
improvements (see #6189)
would also help.

martin