Mouse Scroll wheel not working on smaller windows in acrobat

Hi there, 

Has anyone had a problem recently occur within Acrobat. I am working in the accessibility tags window and becasue the scroll wheel isn't working I am having to use the arrow keys which really isn't helpoful at all. The same thing is also happening in the other smaller windows i.e. Prepare form, etc.. etc..

Any help will be greatly appreciated.

Steve