I experienced this bug today for the first time. I am using X1 and had just opened a new drawing, selected the elipse tool and drew a circle (using the Ctrl key), I changed the fill color (flat) and then drew a freehand line and tried to chang the line width of the the freehand line. (I haven't been able to reproduce the error)

It appeared to me that the drop down was trying to show, but was not appearing on top. It seemed this way because a black line appeared just below where the bottom of the drop down box is, in it's rolled-up state. This leads me to believe that the drop down is working, but it is showing up beneath the info bar and drawing.

Also when I manually typed in the required line width, the line width of the selected item did remain at what I changed it to. (i.e. it didn't return to 0.5 pts)

Just my experiences and thoughts.

Eric