I am having the same issue this person is having..... so glad I found someone having same/similar issue I thought it was just me..... Click here to view other thread
(FYI link above is not me just another person with similar issue (Links to a diff website))
Except my issue occurs with any grouped windows.... I have tried new mice, new usb ports, new drivers, uninstalling/reinstalling, rebooting ect. with no luck. For my job my windows have to be locked in a particular spot on the screen, but since sometimes clicking on grouped tab moves the whole window it messes everything up. It does not do this on windows not grouped.
I really need a fix for this badly....
Extra note: The main windows/groups having issues are windows not set to full maximize, and i can't just set them to that as it would mess up my job.... And it will sometimes drag the whole window, or just the tab itself even if my finger is off the mouse button.