so I've had (even with 3d checked) the whole software rendering mode on mint cinnamon 18.2 and 18.3 over last 2-3 updates to virtualbox. 17.x series has had no issues.
tried everything suggested before, remove guest additions/reinstall them, etc. no help.
so last night I got to wondering about display manager stuff so ran
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sudo apt-install gdm
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sudo dpkg-reconfigure gdm
I then rebooted and during login just chose cinammon. it all worked.
so I then ran
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sudo dpkg-reconfigure ldm
so to test I built up 2 vm's, one 18.2 and one 18.3 left both stock (no updates) and got the software rendering mode.
did this procedure on both, both worked fine afterwards.
not sure why this happens, know virtualbox has some gnome dependencies, possibly one wasn't met during guest addition install the the install gdm fixed.
anyways, thought maybe this would help someone.