I'm kind of dumbfounded with this one, probably because I'm a total noob when it comes to server management beyond the control panel (which, in this case, is VestaCP.)

I use Google PageSpeed Service and it works well, until the Facebook scraper tries to load a page and gets a 500 internal server error thrown back at it. This is a problem for my live and actively shared sites.

Does anyone know what'd cause these conditions to return a 500 for the Facebook scraper (and debugger tool):

- Only happens only htaccess URL rewritten pages (also including the root /, but trying index.php directly works)
- Only happens on sites using Google PageSpeed Service. Yes, I've tried deactivating the rewriters, but it doesn't seem to be any of those.
- Works when using nginx's caching template on VestaCP. None of the others work. Also unticking "nginx support" doesn't change anything (but headers indicate nginx is still being served). However, I can't really keep this active because I have dynamic features that break when this is activated.

Remember, the sites seem to load fine otherwise, just for the FB scraper. Any suggestions?