CMD+V - pastes twice, why?

I have installed launchbar the current version on OS X Mountain Lion and when I 'cmd+v' only rather than 'cmd+vv' which is the selected short cut, in other words I am trying to use the mac's cut and paste command, I get the contents of the current clipboard pasted not once but twice and this happens intermittently. Has anyone come across this issue before and is there a solution for this?
P.S. this has only happened once I installed launch bar.