Have just purchases two new Microsoft Wireless Mouse 5000 for two different computers. On both computers (Windows 7 x64, all current updates), when scrolling down using the wheel, the page will scroll up a couple of lines every so often as you go down. This seems to happen in all applications - IE8, Word, Outlook, etc.
I've tried the default Windows 7 drivers and the latest IntelliPoint software (7.10.344.0) but the problem is the same.
I used the Microsoft Mouse Diagnostics to check and if I monitor the "Last Z value", I see it goes to -30 (as it should) as I'm scrolling down and every so often it will change to 60 and the page will jump up slightly before continuing down.
This is driving me crazy, can anybody help?