Are you sure to be running revision 1673 from the PPA (if you performed the installation before launchpad had finished building it, in that case, you are running an older version of Onboard)?
I just switched to my saucy partition and installed Onboard from the PPA. The polygonial Return key of the Full Keyboard layout shipping with the package in the PPA is visible and Onboard seems to be working correctly.
Are you sure to be running revision 1673 from the PPA (if you performed the installation before launchpad had finished building it, in that case, you are running an older version of Onboard)?
I just switched to my saucy partition and installed Onboard from the PPA. The polygonial Return key of the Full Keyboard layout shipping with the package in the PPA is visible and Onboard seems to be working correctly.