My Draft SIght goes black after an hour or so of operation. It simply goes black. If I do a sweep selection I find that the drawing is still there, but I cannot see it.

I need to save, close and reopen drawqwing to keep working. This annoying I must do several times in a two hour session.

I have posted two comments on this issue several months ago. I got not one single answer to it. I had even forgotten I had registered in the forum. However I today find two emails announcing cancellation of my request because "no further correspondence has taken place" Goodness Gracious, I got not one reply to it.