Control System Designer: Select Blocks

Hi everyone:

I have a Simulink script in which I have a plant and two PID controllers. When I click on "Analysis->Control System Designer -> Select Blocks" only one of the PIDs appear.

The script is very similar to another one in which I haven't that problem, so I don't know whats happening.

Anyone knows what's the problem?

Thank you :)

[Arkadiy Turevskiy]

Can you attach a model and post a screenshot of the dialog where you see only one PID Controller block. I just tried it with a similar model, and I can select both PID blocks just fine.