My Corel PHOTO-PAINT 12 is not working properly.

 Hi guys,

Could anyone help me, I am not an expert in Corel DRAW but my corel PHOTO-PAINT 12 is showing a problem.

When I edit a pictures and try to work with CLONE feature, each time, after I select the target, I press to clone, it activate the UNDO button, and nothing happen with my changes.

Help please,

Manpito.