Very strange
As the forum and the site are completely unrelated, I don't see what could cause issues on both with missing page contents.
On the alternate titles page, can you show the page source (Ctrl+U / Command+U, I suppose in these browsers too) copy/paste that to a text document and send me the whole content? (maybe put that in a zip file, so it arrives more safely)
So I can see if it is because something is missing/modified in the page by the browser or if it is something else.