Jeff, a couple of things you can check:
1. In the Styles dialog, look at the "Lists" style (may be in
the "Other" category) and make sure the Before value is set to
zero.
2. Open your CSS file in Notepad or some other text editor
and check the OL, UL style to make sure there aren't any margin-top
or padding-top values. If nothing is there, you may want to add
margin-top:0; and padding-top:0; to specifically tell RH that you
don't want any space before your lists.
Let us know what turns up.
--Ben