NVFBC_ERROR_INVALIDATED_SESSION

Hello,
I have encountered a weird problem as follows: when I hide all windows on the desktop and capture the desktop by NVFBC, the function NvFBCHWEncGrabFrame() always returns an error with NVFBC_ERROR_INVALIDATED_SESSION, even when recreate the NVFBC object. To get correct return message NVFBC_SUCCESS, there must be a mouse move message occur on active window

I have encoutered the same problem.

I´m trying to run the SKD´s samples on a Windows Server 2016 - Tesla M60 - Cuda SDK 8.0.

I also don´t understand how to enable those logs. Is that on the terminal? A confile file?

Thank you in advance.