[Peter Staab]

I had the same problem with Sony Vegas 12 for months. Sometimes rendering worked fine, then it stopped somewhere in the middle.
But I think I found a solution:

Method 1 (as mentioned above):
– Go to “Options” – “Preferences” and disable GPU acceleration

Method 2 (if you have multiple graphic cards, such as the Intel on the mainboard and an external Nvidia/Amd one):
– Go to “Options” – “Preferences” and select the external graphics card (the internal Intel HD4000 seems to cause the problems on my device), click “Apply” and restart Sony Vegas

IMPORTANT: to change settings start Vegas as administrator (right click on the Sony Vegas icon -> “Run as administrator”). Without doing this, both methods did not work for me. After changing the settings you can start Vegas normally again.