Yeah, yeah! I have this problem too... I searched on the forums for a solution and... yeah, it's good to know that it's a bug too!! I couldn't find a solution for that in Corel Draw 10!!
:-(
So, the only solution is by changing the width in the line properties after selecting it.
The other funny thing (not realy funny when u loose time searching for it!), is that this changes in the properties can't be changed neither in some systems (depends on the language definition -configuration panel- & the diskette of format), you have to try then both point & comma!!
It works like that, but I didn't succeed to save these configurations!
aous448@usa.net