Is there a standard command in a macro that will move one to the bottom
of a range?

The row count varies, and I always want to get to the bottom, and
recording a macro doesn't work as it uses direct references.

Also, for some reason, ever since I opened this workbook in 2010 beta,
I get a 400 error in my sheet manipulation routine. It never happened in
2007, but now even happens in that release. Did opening change something
about the workbook that I do not know about?

It used to work fine.

I do think that I have a very recent, pre-2010 backup, however. I
haven't tried to see if that one does it as well. If it does, does that
make it a registry problem, since my 2010 install was told to keep the
current version intact? Both are 32 bit. The 2007 is pro, and the 2010
is a beta offering I DLd from MS.