It happened yesterday to me, I can confirm.
Probably some xorg changes? some qt issue?
I would say this isn't a vbox fault
** Changed in: virtualbox (Ubuntu)
Status: New => Confirmed
** Changed in: virtualbox (Ubuntu)
Importance: Undecided => Critical
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https://bugs.launchpad.net/bugs/1666059
Title:
Main virtualbox window resizes itself 4 or 4 times - then no start
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