When Draftsight woke up this morning, it decided to do things a bit differently. Effectively, all blocks (toilets, urinals, doors, windows and things you might find in an office building) are completely distorted. If I zoom in close enough, I can see clearly and the distortion goes. As soon as I zoom out, its all over the place and I can't actually move blocks around because I can't see how they 'fit in' to the rest of the layout. I've tried rebuilding the drawing from the View menu, but to no effect.

Can anyone help please?