Same problem here. Tried to render an HD sequence in pretty much any format (MPG, H.264, WMV, MOV) and it either stalls or crashes Premiere CC 2014.
- Windows 8.1
- Core i5 2550k @3.3Ghz
- NVIDIA GeForce GTX 560 Ti
- 16GB RAM
Been using this system for ~2 years with Premiere Pro CS6 with no issues.