Unable to use VC after 5.07 upgrade

[speakerfreak]

Hi,

Has anyone else had problems with sync errors after upgrading this? I am on Mavericks but 5.03 was working (mostly). Now I get 'A sync error ocured. press stop and play to clear' every single time with no sound from my Virus TI 1.

I am running Logic Pro X (although I have also checked it in Pro 9), on a Macbook Pro 2013 (so USB 3.0 ports). Usually I use an Apogee Duet soundcard but I have even disconnected every other USB cable and tried using the Virus on it's own outputting to the internal speakers.

Does anyone know if it is possible to downgrade at least? Thanks, anything I have missed out please feel free to ask.