Saw an earlier post of same problem on update 9.2. I had no problem until just now when I updated to 9.4 and suddenly my OTA channels are blacked out. I still have a guide and signal strength meter tells me I’m getting reception. Upon troubleshooting myself, I discovered that taking out the jump drive and disconnecting pause and rewind function allowed the picture to come in. I reformatted my jump drive on my computer and jump drive was good. I reinserted into TV and went through the setups for pause and rewind and same problem. Curious note— if I pause even with black screen and then FF, I can see the progress of the FF on screen but when play resumes it goes back to black. Again...problem only occurred after updating to version 9.4.
I have the same issue and had the same solution to remove the USB stick and reformat. But the problem came back and I removed the USB stick for Live TV Pause permanently. Now the TV won't find any channels when I try to Scan for Channels w/out the USB stick. I have no live TV!!! Help....
Since my post I have the problem occur several times and I unplug the tv for 30 seconds or so and it fixes. Inconvenient but still works. I am still using the USB for pause and rewind. Hope this helps and hope Roku provides a permanent fix in the next update.
The unplug trick did not work for me. Has anyone else come up with any additional fixes?