I just checked Rex in PP2014 SR3 using the supplied .wav files and he works just fine. i72600k and 8 gig ram on Win7 Ultimate.

 

Did you use the supplied .wav or one of your own? The manual contains info on the Talk Designer, but there are a few omitions and the Mac info is incorrect. I spent a long time finding this out helping someone else on another board.

 

If you post your work flow I can help you out or if you are willing to wait a bit I will whip up some kind of tute for you. If you are using your own audio file make sure the sampling rate is 1024