Thanks Marcel, unfortunately, no, the problem I'm having has nothing
to do with SystemWindows, just plain Morphs.

I found a way you can see the problem yourself.  If you would be
willing to install the head release of Maui into a 5.0 trunk image,
and then in a workspace:

   | morph | morph := FileDirectory default entries maui.
   World doOneCycleNow.
   morph regenerateHeading.
   World doOneCycleNow.  "<--- Argh, need this 2nd one now for it to
fully update!  Why?"

If you try the above once each for the two different versions of
Morph>>#layoutProportionallyIn:, with (mt 4/19/2015 11:06), each
subsequent column header is above the one to its left, as it should
be.  However, with (mt 4/24/2015 10:11), the z-order is reversed,
causing my column sort buttons to be covered up, inaccessible for
application users.

Best,
  Chris

On Tue, Aug 25, 2015 at 4:48 AM, marcel.taeumel <Marcel.Taeumel at hpi.de> wrote:
> Hi Chris,
>
> does this fix your problem?
> http://forum.world.st/The-Trunk-Morphic-mt-999-mcz-td4845514.html
>
> Best,
> Marcel
>
>
>
> --
> View this message in context: http://forum.world.st/What-happened-to-Morph-layering-tp4845404p4845515.html
> Sent from the Squeak - Dev mailing list archive at Nabble.com.
>