Problems adding new devices

Dear All,
I’m trying to add a few new devices to my Vera 2. No matter what I do, the Vera and the devices refuse to communicate. I tried with the following devices:

  • A clamp power meter from Aeon Labs
  • A zwaveme 4 button key fob
  • Two different dimmers from Fibaro

This begins to annoy me quit a lot. I would be greatful for any tips on how to begin the trouble shooting.

Sincerely yours,
Niklas