移动主机后找不到文件

I moved host the other day and copied an exact copy of the structure and files from the old host to the new one. The structure is the same and if I ftp to my new host, I can see them all sitting there the way they were on the old host. Problem is that I now get loads of php-errors saying that certain files don't exist; it can't find the pics on the website anymore, etc., even though I can see them sitting there the entire time. While it has no problem finding some files, other files it just doesn't see anymore, even files in the same directory with one another.

I have never seen this before, can anybody tell me what is going on here?