Today I am releasing version Beta 2.04 of this plugin, you can download it and read the changelog on the Download page. This is an important bugfix release and all users should update as soon as possible.
The main issue fixed in this release is an error that was causing render parameters to load incorrectly. This error would cause Cycles to perform renders with a huge MIS map for the environment which would eat up a lot of RAM, slow down render speed, and potentially crash CUDA renders due to limited GPU memory.
This release also includes experimental CUDA support for the latest NVIDIA cards. I lack the hardware to test this myself, but I expect that it will work. If you have one of these cards, please give it a try and let me know if you find any problems.