Logged In: YES 
user_id=154693

 Hello!

I solved my problem by removing all references to
Queue.queue instances in my python code. --> my usage of
Queues was so heavy that it was triggering a nice bug in
python synchronization code.

I was pointed to threading issues by enabling full trace in
my python code, and some traces were showing code from
threading.py

thanks a lot anyway for the help.

Stan.