Not the style - any custom styles on the forums where it wasn't working are mostly just color changes anyway.
It works on two more highly customized forums and gave that error on two other forums. The ones where it works are on a different server. Most of the plugins are the same. Disabling those that weren't the same (other than Sphinx search) mad no difference.
The ones where it wasn't working were both using Sphinx search (the digitalpoint add-on).
However, I edited the template memberaction_dropdown_lynne_view_threads as follows and then it works on the two forums with sphinx search:
Change:
Code:
<a class="siteicon_forum" href="search.php?{vb:raw session.sessionurl}do=finduser&userid={vb:raw memberinfo.userid}&starteronly=1&contenttype=vBForum_Post" rel="nofollow">
To:
Code:
<a class="siteicon_forum" href="search.php?{vb:raw session.sessionurl}do=finduser&userid={vb:raw memberinfo.userid}&starteronly=1&contenttype=vBForum_Thread" rel="nofollow">
which incidentally is the default link to find recently started threads on the member profile page.