Again, I can't help unless you give me a little more information to go on. Open Sketchup and go to Plugins> V-Ray> Open Debug Window. What is the full version of V-Ray that you are running "2.00.XXXXX". There is a service release out that fixes a lot of the issues with RT. It could also be an incompatibility with your computer system so specs of the computer are useful see thread: http://sketchucation.com/forums/viewtopic.php?f=322%26amp;t=26019.
The more information you provide, the easier it is for me to help. "RT bug-splats when I render." is not helpful when trying to track down a problem.