This problem is caused by the lack of speed with your graphics card. This is why the model degrades from circular to triangular, to a block. Try the following:


1) Delete the ".XML" file for the job. This will completely reset the graphics state for this job.

2) In the "configuration module", go to the "3D Viewer Settings" tab. On this tab, reduce the "frame rate" setting to 1. You'll have to type this value in, since the spinner only goes down as far as "5".

3) If this doesn't work, see if you can download more recent drivers for your graphics board, from your graphics board vendor.

4) If none of the above options work, upgrade your graphics card.