This is not a big issue but it is not working as it supposed to be.
Click the menu Settings then Options, then choose Model=>Physical Model on the left-hand windows, then select the tab Workspace. The value of Pen Width won’t change if you click the up/down arrow. Even if you type a value in and save it by click Apply and OK and open the Option window again, it is back to 1.
I noticed that I could change the Pen Width on the WS using the Format window though.
By the way it seems the Default DataType setting for Oracle 10g can’t be saved, e.g. I specify the Default Data Type to Varchar2(%p1 %p2) and click Apply and OK. But when I open it again, the Default Data Type is blank.