bookerenglish on "Pages tabs"

I am using the Andreas Viklund theme and I am having problems with the appearance of my pages tabs which are overlapping as I add more. This does not occur on my Mac, but does on PCs which is what we use at school.
Page parents don't seem to work, meaning that when I hover over a page tab the nested pages don't show. That would have helped a little. I'd rather not nest, if I don't have to anyway. None of the other themes does what I need - so I hope you have a solution.