I had a strange problem with mouseemu with similar symptoms. Can you check if it is installed, (since it isn't needed, because synaptics provides extra mouse button tapping, scrolling, etc) and try to remove and see if the issue remains? :)
I had a strange problem with mouseemu with similar symptoms. Can you check if it is installed, (since it isn't needed, because synaptics provides extra mouse button tapping, scrolling, etc) and try to remove and see if the issue remains? :)