Frozen "Waiting event"

Hello, sorry for my english =)

I have two separate Infrastructure with vCloud Director 5.5. In each infrastructure i have vCO server (appliance) + vCD plugin.

When i installed vCD plugin, was installed vCloud Workflows.

If i run workflow "Add an organization" - all will be alright. But if i run workflow "Add a network pool" (it problem with all workflow, which include action "Waiting event"), then workflow will frozen on "Waiting event" while you not cancel workflow, but network pool will be added.

i can see this problem in follow combinations:

vCO 5.1 + vCD plugin 5.5

vCO 5.5 + vCD plugin 5.1

vCO 5.5 + vCD plugin 5.5

And i have this  problem in all infrastructures

Any ideas?