Long story short:
If I run Desktop Effects compositing and use OpenGL rendering, I get an odd shifted title bar and window decorations. If I switch the compositing type to XRender, everything renders properly (albeit, very slowly).
My guess on how to fix this (and be able to run OpenGL compositing) would be to find an older driver and install that.
I'm running an old Nvidia card - an AGP GeForce MX420, iirc.
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