Wireless Mouse Problem


I own a BenQ M310 wireless mouse that used to work fine with my G4 iBook. I hooked it up today for the first time in several months -- I believe I've upgraded from Panther to Tiger since using it last -- and now have the following weirdness: the cursor moves around all over the screen just fine, but as soon as I left-click or right-click, the cursor jumps to the top left corner and the Apple menu drops down. If I disconnect and reconnect the USB wireless receiver, then a mouse-click results in the cursor jumping to the top right corner, and the Spotlight bar drops down. Has anyone else seen this behavior?