Reply to skip through track problem

been noticing lately that when i use the mouse to click through the track (in the stripe area), it doesn't skip through the track properly, you click and it does nothing.

i only use the mouse to flick through the track when I'm travelling and can't connect my controllers.

using TSP 2.6.3 OSX 10.8.5

any help or ideas on what fixes it would be appreciated, at the moment it seems the only way is to restart tractor.

thanks