CorelDRAW Graphics Suite X6 :: Outline Width Of Object Set To 2 Mm

I use Corel Draw X6.4 on a 64-bit Windows 7 PC, but since the first installation of Corel Draw X6 I have following problem:

I use millimeters as metric scale and when I create any object, the object manager states that the outline width of that object is set to 2 mm, but it is obvious that the width is only 0.2 mm. Now if I try to change the outline width to 1 mm, Corel draws the outline with a width of 10 mm instead and the object manager says that the width is even 100 mm. To solve that problem I always have pressed the Undo-button, so the width changes to the desired 1 mm but the object manager still tells me that the width is 10 mm.