Sounds like a Qt issue (similar to #1637020).
** Package changed: vlc (Ubuntu) => qtbase-opensource-src (Ubuntu)
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https://bugs.launchpad.net/bugs/1637034
Title:
Ubuntu
So far, you've not listed an application from the MATE desktop as being
affected by this issue, in fact you specifically state that Caja (the
MATE file manager) work correctly.
I also have no way to reproduce this issue given your exotic hardware
configuration :-(
** Also affects: dolphin
