Have you tried Alt+r (refresh)?

On Fri, 2002-07-12 at 08:39, Stan Heckman wrote:
> Switching Squeak to full screen mode in Ion (using the menus, not the
> command line switch) painted a white screen plus one Squeak window
> (the Change Sorter, I think) in a rectangle that was almost the full
> size of my physical screen, just a few pixels shy on the right and on
> the bottom. These few pixels would be exactly enough to hold the
> border and tabs that Ion would normally draw around the
> window. Reaching into this few pixel area to grab an Ion tab and
> sweeping that tab over this white rectangle revealed the rest of my
> windows, but as before, if I do anything in those windows no changes
> are painted to the display until I damage the region with one of Ion's
> tabs.
> 
> This is more of a curiosity than a problem; I'm reasonably happy with
> Sawfish. 
> 
> -- 
> Stan
> 
>