This is a pesky one. 

It even goes so far as to make it so I can't use the X environment outside.

I am using i3 (tiled wm). I do notice this starts happening when i move my mouse outside the VM and use the Ctrl key.

See earlier thread:

http://lists.freebsd.org/pipermail/freebsd-emulation/2014-February/011306.html


$ freebsd-version -ku; uname -apKU                                                                  
10.1-RELEASE-p14
10.1-RELEASE-p14
FreeBSD z600 10.1-RELEASE-p14 FreeBSD 10.1-RELEASE-p14 #14: Tue Jul 14 14:26:13 CDT 2015     root@z600:/usr/obj/usr/src/sys/MYKERNEL  amd64 amd64 1001000 1001000


$ sudo pkg info virtualbox-ose-4.3.30 
Password:
virtualbox-ose-4.3.30
Name           : virtualbox-ose
Version        : 4.3.30
Installed on   : Sun Jul 12 07:33:02 CDT 2015
Origin         : emulators/virtualbox-ose
Architecture   : freebsd:10:x86:64
Prefix         : /usr/local
Categories     : emulators
Licenses       : GPLv2
Maintainer     : vbox@FreeBSD.org
WWW            : http://www.virtualbox.org/
Comment        : General-purpose full virtualizer for x86 hardware
Options        :

$ sudo pkg info virtualbox-ose-kmod-4.3.30 
virtualbox-ose-kmod-4.3.30
Name           : virtualbox-ose-kmod
Version        : 4.3.30
Installed on   : Sun Jul 12 07:33:01 CDT 2015
Origin         : emulators/virtualbox-ose-kmod
Architecture   : freebsd:10:x86:64
Prefix         : /usr/local
Categories     : kld emulators
Licenses       : GPLv2
Maintainer     : vbox@FreeBSD.org
WWW            : http://www.virtualbox.org/
Comment        : VirtualBox kernel module for FreeBSD