The first one makes no sense to me at all as there is no variable/object named ‘spUser’ – only one named ‘spThisUser’.
The second one however is definitely incorrect and oddly, has been for a little while now. Would only be noticed by those with sub-forums I believe, which probably explains why it has been missed.
Are you up for a small code edit? If so then the plugin file you need is /simple-press/forum/content/classes/sp-forum-view-class.php – and the code line 557 in the function sp_forumview_build_subforums().
See this line of code (557):
if($spThisUser-_newposts && $spThisUser->newposts['forums']) {
That underscore in front of ‘newposts’ should be a right angle bracket as in:
if($spThisUser->newposts && $spThisUser->newposts['forums']) {
and I will make sure this is fixed up in the next update. Apologies fore that. It is odd how some of these things sit there for months unnoticed!