I disabled all of the plugins and thought it was W3 Total Cache at first, but then I ended up with other errors.
I disabled all caching and it was still broken. I addressed each problem individually, and after a few hours of trying different things, I changed
memory_limit = 62M ;
to
memory_limit = 128M ;
in php.ini in my root folder and re-enabled the W3 Total Caching. That seemed to fix the problem.
Resolved!
Thanks for your help!
