After updating GPU, movies are shown dark while editing

Question:

When NVIDIA GeForce driver was updated to the latest 340.52,
movies are shown dark while editing.
Also, you may not find CUDA options.

Answer:

The problem cause is under investigation. (as of August 1, 2014)

Please go to http://www.nvidia.co.jp/Download/Find.aspx?lang=en
and roll it back to the previous version 340.43, 337.88, etc. in the mean time.

Update: March 16, 2015
LoiLoScope2.5.4.2 is ready to fix this problem.
 http://loilo.tv/product/video_editor

Note: You may see slightly higher CPU usage with this version, so it is highly recommended this to be used for NVIDIA users only.