I upgraded to V1R5.0 and now drawings open but nothing is displayed on the screen. I can start a fresh drawing and place a line on the drawing. The cursor is displayed in the correct coordinate and the line is display while I move the mouse. When I click the mouse to end the line, the line disappears from the screen. If I 'select all' the correct number of entities is displayed in the properties box but the highlighted line which should have handles/grips on it is not displayed nor are the handle/grips... Just a black screen. Everything seems to work, just nothing is displayed. I have checked the drafting options and everything seems to be in place. The video driver worked fine with V1R4. Maybe there is a problem with V15.0?

I would like to reload V1R4 but do not know where to retrieve it. Any assistance would be greatly appreciated.