Just installed 19. No change, ie, Theater view does not work
And honestly, it won't if you're using a Sandy Bridge-era CPU (with HD 2000/3000 onboard graphics) on Windows 10. This is a Intel issue for never releasing Windows 10 drivers for the Sandy Bridge CPU's onboard graphics. There's really nothing JRiver/Hendrik can do about this.
Using the legacy Direct3D option is just a temporary measure, JRiver/Hendrik has already said it's going to removed eventually, so I would not recommend using this as a solution, because it isn't one.
To anyone encountering this issue, I'd highly start consider either a) upgrading CPU/motherboard/hardware to something that's a little more "modern" and is supported on Windows 10, b) consider adding a dedicated GPU to the system if possible or c) downgrading from Windows 10 to Windows 8.1 where OpenGL 2.1 will work. Honestly though, if you're still running a Sandy Bridge/Ivy Bridge-era CPU and hardware, I'd
HIGHLY consider upgrading anyways because older hardware like this isn't going to be supported forever.
Hendrik, is it possible to change what the GLengine error says? At least informing the user their hardware/CPU/onboard graphics isn't supported on Windows 10 if they're using Sandy Bridge or older.