It's permissions related. No idea why they changed, or how, but here's where I'm at...
I have a phpinfo.php that's 755, owner/group is the apache user. It works. I have a WAP plugin for my site that works, with the whole folder structure 755 with the same owner/group.
I figured "hey, it worked there", so I 755'd my whole forum folder, and set the owner/group to the apache user again, but I still get 500s on all of my vB pages.
I'm making some progress but my eyeballs are starting to bug out... If anyone has any ideas I'll try just about anything at this point. I've chmodded my face off for the last several hours and am running out of ideas.
--------------- Added [DATE]1427081379[/DATE] at [TIME]1427081379[/TIME] ---------------
Just to keep it updated - I rebuild apache, disabled suexec and suphp, still no dice.