I have a similar problem that occurs only with OS v3.5.  Basically, I do
this:

  int dummy;
  WinHandle Save;
  RectangleType screen = {{0,0},{160,160}};

  Save=WinCreateOffscreenWindow(160,160,screenFormat,(Word *)&dummy);
  WinCopyRectangle(WinGetDisplayWindow(),Save,&screen,0,0,scrCopy);

This causes POSER to give the following error:

...just read from memory location 0x80000020.  This usually means that the
application is calling a Window Manager Function without first
establishing a valid DrawWindow.

It be great if someone can point out what's going on here!

Thanks.

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