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Virtualbox 4.2.10 Auto resize not working. Will auto-resize down but not up unless in full screen

Using Virtualbox 4.2.10 with Windows 7 as host and guest.

If I press Ctrl+F, the OS goes full screen. If I check the resolution, it says 1680×1050 -- same size as my host OS that has many (approximately 20) other options, including MUCH bigger resolutions.

Now if I press Ctrl+F again (I want it to just fill the available window), it goes back down to 1024×732.

If I shrink the window, the resolution DOES scale down, BUT will not scale back up when I resize the window again. When I check the resolution after resizing it down, it's at 640×480 (no other options available).

Here is a video describing the problem: renegew [DOT] com/vm1.mp4

Could someone please help me fix this odd problem?

Configuration:

Host
-------------
Windows 7
16 GB RAM
2 Nvidia 680's (factory overclock) on SLI (4GB for each video card)
CPU virtualization turned on

Guest
-------------
Windows 7
4 GB RAM
Guest tools installed

Also posted here: superuser [DOT] com/questions/579819/virtualbox-4-2-10-auto-resize-not-working-will-auto-resize-down-but-not-up-unle

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