Cheers Jouse! Fixed.
Is this a common problem caused by permalinks, or is it safe to say I have a poor hosting solution?

Hi, we are having the same issue on our site. The first post loads the whole page, but with any subsequent posts the page doesn’t load beyond the header. We only have one plugin installed – ‘Follow’, but deactivating that doesn’t make a difference. Any ideas? Website address is acys[DOT]info. Thank you.