Can you upgrade an Expressway from 12.5. to 14.0 or do you have to upgrade to 12.7 prior to 14.0?

                   I have  HDX8000 and a C90  in a conference call on a 4510 Codian Bridge we are seeing a cloudy white arifact covering the Lower third of our Display this happens throughout the conference sporadically and only lasts for a half a se...