Xephyr in a dual screen mode not working

[Rice, James M CIV NSWCDD, K73]

First I would like to note that this is not multi-seat.

I am trying to set up Xephyr to run on a thin client, and remotely connect to a machine that requires a dual monitor display for its application.  It also must be full screen to display the application correctly.

First I set up dual monitor with xrandr

>xrandr --output DVI-I-2 --mode 1280x1024 --output DVI-I-1 --mode 1280x1024 --above DVI-I-2

And all is well, then I attempt to run Xephyr...

>Xephyr :1 -query myhost -once -fullscreen -keybd ephyr,,,xkbmodel=uvdev

Xephyr only displays on the bottom display, oddly enough, if I make the displays overlap by a few pixels (discovered this by accident)..

xrandr --output DVI-I-2 --pos 0x1020

Xephyr covers both monitors, but my application runs a little quirky, but then if I log out, and change the positions back correctly, then run Xephyr again, it works!

Any insights, work-arounds?

Thanks in advance for any help!
James.
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