After a bit of digging, I've commented out two lines in 
src/VBox/Frontends/VirtualBox/src/runtime/normal/UIMachineWindowNormal.cpp 
that call VBoxGlobal::normalizeGeometry.  That stops client windows from
becoming midgets.

Looking further into the logs it looks like VBox gets told my desktop
is 5 pixels high (!)

00:00:00.525738 GUI: 
UIDesktopWidgetWatchdog::sltHandleHostScreenAvailableGeometryCalculated: Screen 
0 work area is actually resized to: 0x599 x 1920x5

and then sends a setGeometry() request with height set to -26.

If I get time I'll try and figure out Whisky Tango Foxtrot

On Thu, Jun 15, 2017 at 04:01:51PM +0100, Gary Palmer wrote:
> 
> [ add cc of v...@freebsd.org which is a better list for this I think ]
> 
> Hi,
> 
> Updating to the correct Guest Additions doesn't fix the issue.  Whether
> GA is installed or not doesn't seem to make much difference to this problem
> 
> I've also changed from QT4 (which I was using) to QT5 with no change
> 
> Thanks,
> 
> Gary
> 
> On Thu, Jun 15, 2017 at 01:08:20PM +0200, Daniel Tihanyi wrote:
> > Hi,
> > 
> > Do you have the right version of Guest Additions installed on your
> > guests? I also have Windows 10 as a VM in VirtualBox (though it's
> > FreeBSD 11), but it works for me without any problems.
> > 
> > Daniel Tihanyi
> > 
> > On Wed, 2017-06-14 at 11:54 +0100, Gary Palmer wrote:
> > > Hi,
> > > 
> > > Ever since upgrading from vbox 4 (which had occasional window placement
> > > or size issues, but nothing serious), vbox 5 has consistently had a 
> > > problem
> > > where on starting a VM the window height is always reset to a fraction of
> > > what it should be.  If I size the window properly by hand, and then select
> > > View -> Adjust Window Size it goes back to the wrong size again.
> > > 
> > > Anyone else seen this?
> > > 
> > > With Win10 it's worse - unless I maximise the window it keeps getting 
> > > reset
> > > to the wrong height, I think by communication with the additions installed
> > > in the client.
> > > 
> > > virtualbox-ose-5.1.22_1        General-purpose full virtualizer for x86 
> > > hardware
> > > virtualbox-ose-kmod-5.1.22     VirtualBox kernel module for FreeBSD
> > > 
> > > 10.3-RELEASE-p18
> > > 
> > > Thanks,
> > > 
> > > Gary
> > > 
> > > P.S. Please keep me on CC as I am not subscribed to this list
> > > _______________________________________________
> > > freebsd-virtualization@freebsd.org mailing list
> > > https://lists.freebsd.org/mailman/listinfo/freebsd-virtualization
> > > To unsubscribe, send any mail to 
> > > "freebsd-virtualization-unsubscr...@freebsd.org"
> > 
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