These questions below may be for a different product... but the KIND of information you need to supply is the same, for the products you use
More information needed for someone to help... please click below and provide the requested information
-Premiere Pro Video Editing Information FAQ http://forums.adobe.com/message/4200840
-WITH the brand/model graphics adapter (ATI or nVidia or ???) and exact driver version
-WITH have you recently updated to the very latest Mac or Windows operating systems?
--Both Windows 10 and Mac 10.11 El Capitan have been known to cause problems... what is YOUR operating system?