The above CSS change worked for me (at least it stopped the dropdown from appearing). But to make the link go to the profile, you can edit the template memberaction_dropdown and find something like this (in the code for that template that I have, it's the second line):
Code:
<a class="username {vb:raw memberinfo.online} popupctrl" href="{vb:link member, {vb:raw memberinfo}}"
and take out popupctrl so that it looks like this:
Code:
<a class="username {vb:raw memberinfo.online}" href="{vb:link member, {vb:raw memberinfo}}"