Gradebook navigation arrow is missing

Hello,

Has anyone else noticed that the arrow that used to appear in the top righthand side of the gradebook (to scroll to the right when the number of grade items exceed the space available on the screen) is now missing? It is still possible to use the scroll bar on the bottom of the page to view items not visible initially, but we are missing the arrows!!

I haven't tested yet, but I wonder if this is also true of other tools?

Are others experiencing this odd behaviour?

Thanks,

Michelle