My Zt desktop mouse some times works and sometimes can't open anything by right mouse button.Have to resort to click on program and then click on play or run to get app to open.Have reloaded software 2 times,but problem always shows back up.Zt tech support has not been a lot of help.Last call to them ,was advised to adjust click speed for mouse.This problem doesn't occur all the time,appears to have mind of it's own.