About this post: http://www-10.lotus.com/ldd/nd6forum.nsf/DateAllThreadedweb/713ab99166a6472785256db7003ecc87?OpenDocument
It has been resolved with this trick:
on Domino 6.0.x and 6.5: server document → Internet Protocols → Domino Web Engine → Web Agents → Run web agents concurrently = Enable
on Domino 5.0.x: server document → Internet Protocols → HTTP → Web Agents → Run web agents concurrently = Enable
This option resolve the “deadlock” in agents concurrent execution.
Special thanks to Lotus Support.
Omar