The recent Windows 10 Anniversary Update can break webcam support in Elgato Game Capture HD software, in certain situations.

For more information:

http://arstechnica.com/information-technology/2016/08/windows-10-anniversary-update-breaks-most-webcams/

For example, certain cameras might start to have a very low frame rate.

A solution is to download the attached file, DisableFrameServer_64bit.reg, and use it to edit your registry.

1) Download DisableFrameServer_64bit.reg
2) Right click on DisableFrameServer_64bit.reg, and choose Run As Administrator
3) Follow the instructions, and offer a confirmation of the changes
4) Restart your PC