Fullscreen problem with 2 X screens

Hi,
I have a problem and I wonder, if it is a known bug or not.

I try to execute 2 instances of the same prog, by :
export DISPLAY=:0.0
draw.pl &
export DISPLAY=:0.1
draw.pl

But the second instance locks up until the first one finishes if I try 
to toggle fullscreen in both. Once I turned it off they work on the 2 
monitors separately in windowed mode nicely.

Any idea to resolv this? It seems that it might be a bug in libSDL 
itself, not the perl module, but maybe...

Thx
Levi