question about 'lock device context' problem

1
Hi,

I am running psychtoolbox on Windows XP, and my program workes great
for about a minute, then a get a message saying "Could not lock device
context for drawing...Fill Rect..." I saw several messages in the past
on this topic, but no clear solution. What is the current status of this
sporadic bug? (I've run the same program on other machines just fine).

thanks,
doris