Hi.
I'm using Corel draw X5 and some time ago my mouse have problem with moving objects. I'm marking some object, and then drag it to another place, but instead of moving, mouse start to marking again.
I restored default settings and problem is still here.
sorry for the dumb question, but... have you tried with a different mouse?
if you select the object... could you move it with the arrow keys or using the Transform docker?