I think one of my posts got imported w/o a value for the allow_comments as when I do a full rebuild, I get this warning:
Use of uninitialized value in string eq at
lib/MT/Template/Context.pm line 1379.
I changed it to
CODE
$cond{EntryIfCommentsOpen} = defined($next->allow_comments) && $next->allow_comments eq '1';
and the warning went away.