Right Click duplicate won't work

I am using CorelDraw X4 and I have been using the function where you select an object with the left click and drag to new position and then right click which will then make a duplicate of the object in the new position.

About a month ago this feature has stopped working. I have check the mouse settings and reloaded CorelDraw again. I am running service pack 2. I am using Vista Ultimate with Service Pack 1.

Does anyone know how to fix this problem?

Thanks for any info on this matter.