My mouse... for some reason, won't highlight the file menus when I hover over them....

I have to click on File before the menu drops down... and then click and HOLD to select a sub-menu item.... I never had to do this before... is there a setting somewhere that affects this?

I've rebooted.... seems to work fine once.. then stops...
I've repaired permissions....
Whatelse can I do?

Also mouse doesn't seem to respond to links when I hover over them.