I have one of the Silicon Labs Timing Jitter Attenuator/Clock Generator Si534x/8x/9x evaluation board boards that uses CBPro and I cannot see an output signal after configuring my plan.

The CBPro software has a configuration wizard to help customers create their frequency plan, informing the customer of all the decisions they need to make to  optimize all the settings. CBPro also has an EVB GUI which allows the user to do some debug, control the output regulators and view status alarms while the device is running.  If the outputs are not turning on it is most likely that the output voltage regulators are not on.  To check this,  go to the EVB GUI and click on the Regulators tab and turn on the output regulators.  They are operable independently.

One can also control the output regulators from the EVB so the PC is not required to turn on the regulators.  There is an Enable jumper that can be installed for each of the outputs.  When the jumper is set this enables the output.  Then there is another jumper that can be installed to select between 1.8V, 2.5V and 3.3V.  Attached is an image of a Si5394 EVB pointing to the output driver jumper area for output 1.