Which TVP are you on now, and what do you mean by "nothing happens"? Does the Export panel just continue to sit there, or close with no progress bar showing up, or go through all its motions without actually creating a JPEG file?
Desktop PC W7Pro -64 bit OS; 32.0 GB RAM
Processor: i7-2600 CPU@3.40GHz
NVIDIA Quadro NVS 420; Intuos4 Wacom tablet
4x24 inch monitors ; LAN