I'm running Zencart pretty vanilla at this point.

I had someone report that there were problems checking out. So I went into admin and was looking around. I think I made some minimal change and now I can't use admin anymore without 500 errors throwing.

My logs don't feel helpful, they reference a module I have and I removed the .php hoping that might fix things.

My host's cpanel shows a high load and some low space on some partitions but not 100% on either.

How do I troubleshoot? I can generate the 500 error anytime I try to check out and when I try to just go to the admin page but it's not really sending a log each time to look through.