Comment 4 for bug 74719

there is in the dosbox forum a thread on this.
The problem appears to be in the X configuration of the screen names.
http://vogons.zetafleet.com/viewtopic.php?t=16730
check the last post of Moe.

Something to do with that you have to specify both leftof and rightof
Could you see if that would fix your problem as well ?