Short cut key (Press Control and right click mouse) is not working

Hello All,

Today when i opened my idea i faced a strange problem.
In my ant files short cut key for going to a declaration (Press Control and right click mouse or press middle key of mouse) is not working.

It is working in java files and ibatis xml files but its not working on those files which belong to ant tasks.
While clicking short key it is not going anywhere.
On other system in my team it is working fine.

It is wasting my a lot of time.

Do any body has any idea about this.

Thanks and Rgds,
Khushwinder