Same here. I purchased 3 Roku Streaming devices and loved the default fish screen saver. Now after no activity it no longer shows a screen saver just a black. I've tried changing the screen saver and restarting the Roku devices and still nothing.
Roku please FIX IT
@lovediamondred, look for a new power saving setting under Settings->System->Power and disable it.
While the OS 10.5 update seems to have fixed many things, I'm also seeing screensaver issues. I have two Streaming Stick+ (3810x) devices. Both have been updated to build 4201-50. All theme category settings are identical. The screensaver on one activates properly, the other never activates.
It worked, it worked, it actually WORKED. Thank you so much. My TCL Roku experience is now correct.
It worked no prob on my LG TV with Roku device but TCL w Roku baked in, I just could not get that screensaver to ignite on its own -- until your clear and excellent troubleshooting. Thanks again.