Everything was working a week ago but today I am unable to save customizations to "Entire Site" but I am able to save to "Current Page". A server error is generated when saving to entire site. I have my web host looking into it but it would be helpful if I knew where the stuff is being saved to ... database, files, ?

I have attached the error screen that comes up when the Save operation fails.

Also, previously when it was working it seemed to take a very long time to save to the entire site. Is this normal or should I ask the host to make some optimizations?

Thanks