I had issues with a host I went back to (Knowing all previous sites had worked fine) and it was my vBulletin that was causing the problems.
I'm not sure if your above issue relates specifically to VB but look into your hosts "mod_security" server settings.
The host I was with threw up SQL and page errors on my VB forum because of a few security settings on their server. - They then modified their settings to whitelist my site.
I'm not sure if your above issue relates specifically to VB but look into your hosts "mod_security" server settings.
The host I was with threw up SQL and page errors on my VB forum because of a few security settings on their server. - They then modified their settings to whitelist my site.