Sorry. We are currently working to get the mocha user forums going again. Here are some more resources that you can use to contact us or connect with other mocha users.
Submit your questions on the contact page and we will have a support rep get back to you shortly.
If you have sales questions, you can submit a case OR call the US sales team at: +1 (646) 797-3323
We also monitor many industry user lists including:
Creative Cow (users post about mocha in host application forums such as After Effects, Final Cut, Smoke, etc.)
Video Copilot (After Effects Related)
fxguide (lots of Flame, Smoke & Nuke users)