The votes are no longer available at https://bugs.gentoo.org/colchange.cgi
CC'ing upstream here as I think its an upstream bug.
Not an upstream bug, no. I cannot reproduce your issue upstream, neither with Bugzilla 4.0, nor with 4.1.1.
Should be fixed now. The problem was: my $field = new Bugzilla::Field({ name => 'votes' }); if (!$field) { Bugzilla::Field->create( { name => 'votes', description => 'Votes', buglist => 1 }); } So Voting was part of Bugzilla before and thus we had that field already but for some reason "buglist" was set to "0" instead of "1". I fixed that now and you should be able to add the Votes column back.