Hi Fabrice,

Zitat von Fabrice Marchant <fabrice.marchant@orange.fr>:
[...]
>   In fact the true application where the problem originally raised is :
> http://fabrice.marchant.free.fr/funLife/
[...]

I only have looked some minutes into the code.
fast browsed ;-)

Both threads use the Graphics-module (via View-module).
Possibly the problem is, that the access
is not protected: use Mutexes, when calling the View.<function>,
so that each Thread only has access to the View-functions
(and the Graphics module's functions), when the other thread
is ready with it's work. Otherwise possibly things become confused.

So, wrap each of the View.<function> calls with
calls to Mutex.lock and Mutex.unlock.

Possibly this is your main problem!


Ciao,
   Oliver


P.S.: The Mutex must be in the environment of both threads,
      so must be defined at the toplevel of the autoPlay.ml,
      which means unit-global, as "running" also is.