What type of computer are you using, desktop or notebook?
What operating system are you using?
What pointing device are you using?
If you are on a Apple notebook and using the touch pad that could be part or all of the problem.
-Resetting the preferences has changed nothing.
Sorry, yes I forgot that.
Windows 7 x64
Please post a screen shot of the LR program window/full screen with the Library module open.
Is this not a problem they care to fix,,,,from my research scrolling problems and lightroom date back quite a ways. I mean this is ridiculous. Scrolling works in every aspect on lightroom except while in grid view while hovering over the folders. BUT if you hover the mouse directly over the scroll bar you can scroll with the mouse wheel!