This could be related to OpenGL texture sizes or something similar.
Unity7 (Compiz) has workarounds to avoid that limitation. And Xfce
avoids it by not using hardware accelerated compositing at all (last I
checked). It's not surprising if only Gnome Shell hits a problem like
this...

Do you get the same bug logging in to "Ubuntu" vs "Ubuntu on Xorg"?

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https://bugs.launchpad.net/bugs/1725836

Title:
  No more than 2 displays work simultaneously

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