hyperthreading locks up sleeping threads

[OlafMeding at gmail.com]

Robin and Roel

Thanks for trying and reporting the results.  Both of you and Tim and
Dave have run the .py program now (all on hyper-threaded CPUs) and none
of you were able to reproduce the problem.

So that indicates that there is something special about our PC.  We are
planing to re-install Windows XP (and nothing else) and try again.

Also, we have one other PC (with a different configuration/CPU) and are
planing to do the same to that PC.

Olaf