NUENDO and RME FIREFACE 800 issues

hello folks…just curious if anyone else out there has had any issues with the latest driver and firm ware updates
for RME fireface 800…I recently had my audio system upgraded to NUENDO 6.5 and installed the latest RME Firmware version 2.77…Totalmix 1.08…and driver 3.1.14.0…my bus setups are the same as they were before…however I have no audio output from the firerface whatso ever…curious…any thoughts welcome…cheers all …Andy C No!se4Pictures.com