I recently upgraded to Window 10 and JRiver 21 and started experiencing an occasional problem and I don't know which upgrade is responsible. I'm also beyond the 30 day reversion period for Windows 10 to Windows 8.1.
I always run JRiver in Theatre mode and sleep my computer when not using it. Sometimes when it wakes up, the screen will stay black with an error message in the middle of the screen (apparently part of JRiver) and it says something along the lines of "Direct3D (device lost)". Next time it happens, I will take full note of the entire text of the error and post it. At this point JRiver does not respond and the screen stays black. The remote will not do anything, the mouse functions and I can get out of the program if I use the keyboard. If I restart JRiver, it runs super slow when navigating through the menu...like it's in slow motion. The only way to make it work properly is to restart the computer.
I did some searching on the issues with DirectX and Direct3D and updated the Intel graphics drivers to the most current version. This did not help. Has anyone else experienced this? Any solutions?