Seems it's nvidia related? Will be great to know, where to post bug report.
fwiw: I see the same missing empty miniwindows preview thumbnails OpenGL renderer string: GeForce GTS 450/PCIe/SSE2 Mesa-demo-x-8.4.0-1.1.x86_64
and changing composter rendering backend to opengl 2.0, 3.1 or xrender doesn't change the missing thumbs.
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