I am still fighting Vantage. Stopping a Vantage render locks up my PC. This is the continued problem with Forest Pack Pro elements not showing up.
Could you try, the next time this happens, opening Task Manager and monitoring the CPU and memory usage? I suspect the memory is being released gradually, which may be causing the machine to remain locked for some time until everything is fully unloaded.
We can try the project here if you prefer to send it. Also if you can do a test with only FP objects in the scene and see if it still occurs. Then give us this sample.
It’s also important to know if we’re talking about a live link render or a standalone Vantage session. If it was a live link, did you stop it the render from Max or Vantage?
Live link and I can’t do anything, except kill my PC by holding down the power button. I just found out that the same thing for GPU renderings.
GPU renderings = V-Ray GPU? If so, it could be a system issue (drivers, hardware, etc.)