Bob Arning wrote:

> >When I open a viewer flap, sometimes 2/3 of the screen flashes, instead
> >of just the flap part.
> 
> Is there anything else in the flashing area? One thing the DamageRecorder does is to merge intersecting rectangles and sometimes, when there are too many, it even merges non-intersecting ones to keep the number down. Knowing what else is in that area may point us to ways to cut down the flashing.

It is related to the project navigator morph. When
flap/ tab is opened is sometimes is in front of the 
navigator or it's an issue with the hierachy of the
in front most morph between the navigator and the flap.
The flap should probably asure that is is behind the navigator
before it shows up on Display.

Karl