No matter what config changes I make, every time I enable page cache, the page loads the next time I refresh the page (on a browser session where I'm not logged into WP), but the next time I refresh, i get a blank page, and there's literally nothing in view source. If I clear all caches (from the dashboard) I can get the page to load after one refresh, but the next refreshes are once again a white screen.
I'm on hostgator with a shared hosting plan. Disk basic is the page cache method. Previously, when I had "disk enhanced" enabled, I would get a 500 server error. Just for giggles, I tried setting it to disk enhanced again and saved settings, now I keep getting this message at the top:
"Preview mode is active: Changed settings will not take effect until preview mode is [deploy], [disable] or [preview]"
The preview looks fine, but if I click deploy, it just refreshes the screen with that same message, like it can't deploy for some reason.
I have wp_content set to 755 permissions as is the w3tc folder under it.