Everything has been working fine until a few days ago. As far as I know, no upgrades or major changes.
I cannot load the site map, I get to the point where I can open a branch, then get internal server error. Then after struggling to get out of that, I get page not found when I try to get to the site map.

Plus, there are issues with the tool bar. It disappears sporadically. Or, if I remember correctly, I get another server error.

I've even followedhttp://www.concrete5.org/index.php?cID=261706&editmode=1... and made the change to concrete/libraries/item_list.php