Hi;

  I have noticed what appears to be a bug in VirtualBox.

  VirtualBox 4.3.24 r98716
  Mac Book Pro running Yosemite and Mac Book Air running Yosemite

  Guest OS are several different instances of Ubuntu 14.04 LTS (server).

  Situation A.
  1. VirtualBox GUI is up;
  2. No Guest OS;
  3. Guest OS is imported via VBoxManage;
  4. Guest OS appears in the GUI as expected;
  5. Guest OS (optionally) is started (with or without UI);
  6. Guest OS status changes as expected;
  7. Guest OS is shutdown via VBoxManage (if it was powered up);
  8. Guest OS changes as expected;
  9. Guest OS is removed (using VBoxManage closemedium --delete and
VBoxManage unregistervm);
  10; Guest OS completely vanishes from GUI (as expected);

Situation B;
The difference between Situation A and Situation B is that one or more
Guest OS vms exist prior to the Guest OS in question is imported,
powered up, shutdown and deleted.

  Situation C:
  In Situation C, the Guest OS that will be deleted occurs first in
order (in time) where there are one or more Guest OS vms that have
been imported (or created freshly) afterwards.  In this case, the
Guest OS removal causes the GUI to display the disk of the Guest OS
for the other remaining Guest OS vms and the VIrtualBox GUI will spin
until terminated with force.  It appears that after the VirtualBox GUI
has been terminated with extreme prejudice :-) that rstarting the
VirtualBox GUI, that the disk images of the remaining Guest OS's  are
correctly displayed.

  I have been able to reproduce this consistently.  What I have not
exhaustively determined is if the buggy behavior only happens if the
Guest OS to be removed is the oldest one.  I have seen instances where
the Guest OS that will be removed is somewhere in the middle (not the
first and not the last) that the bug does not appear, but I have not
exhaustively tested this scenario.

A similar problem is more persistent.  If one runs VBoxManage
unregistervm prior to VBoxManage closemedium (lesson learneed the hard
way; don't do this!), then the disk disassociation can occur even
after all Guest OS's have been removed and the directories and files
under ~/VIrtualBox VMs have been removed.  The only way to prevent the
disk disassociation from occurring again was to cpompletely deinstall
VirtualBox (using the provided tool) and reinstall VirtualBox.

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