WTF

I asked the same question in the "Site suggestions" forum and Quicker said he was going to work on it. Sometimes I have clean edges allowing me to see the page numbers and sometimes I dont.

His red backround is only so big, so when you get a pic that expands the page its not big enough to reach

If I am not mistaken, this was only happening to older threads since the pictures where too big. It won't happen with newer ones since when posting a picture it appears as a thumbnail.
If you want to hit the next page button just go to the top of the thread, there it is located on the left side and shows up fine.