Comment 3 for bug 929408

I believe this is due to touch records not ending properly when touches are accepted before they physically end. Since all touches on a touchpad must go to the same window set, once you send multitouch events to one set of windows you cannot send multitouch events to any other windows anymore because the first touches are still logically active in the server.

A second fix for this issue is that the server should only be looking at physically active touches, not logically active but physically ended touches, when determining the window set to send touches to.