Windows HGL Thread problems

With CVS HEAD (19 October 2005 Australian morning) 
the following minimal modifications to the HGL library 
give a runtime error in the "GTest.exe" example program:

=======================================
...
handleEvent: Before getMessage.
handleEvent: Before yield.
GTest.exe: internal error: resumeThread: thread not 
found
    Please report this as a bug to glasgow-haskell-
bugs@haskell.org,
    or http://www.sourceforge.net/projects/ghc/
=======================================

Without those two putStrLn () calls, none of the three 
example programs "GTests.exe", "Tests.exe" 
or "HelloWorld.exe" displays a Window.

With those two putStrLn () calls, all three example 
programs present their windows and both "Tests.exe" 
and "HelloWorld.exe" appear to run perfectly (although 
note that I have not seen them running at all other than 
in these tests).

Cheers

Mike Thomas

=========================================
==========================
RCS 
file: /home/cvs/root/fptools/libraries/HGL/Graphics/HGL/
Win32/WND.hs,v
retrieving revision 1.9
diff -r1.9 WND.hs
130a131
>   putStrLn "handleEvent: Before yield."
133a135
>     putStrLn "handleEvent: Before getMessage."