EOS R5 C Not Recording to SD Card Even Though REC is Indicated

[madwiser]

No CFExpress card in the camera, just a fast SD card. Recording MP4 10-bit. The red outline shows around the LCD screen when recording. Says "REC" at the top of the screen. BUT nothing records. No files. Put in a CFExpress card. Same thing except it records to the CFExpress card. Hmmm. Take out the CFExpress to repeat the process. This time I notice the tally light on top of the camera stays green during REC. Red box around the LCD, displays REC at the top of the LCD, tally light on top of camera is green - no recording. With CFExpress everything is the same except the tally light on top of the camera is red. I shot for a couple hours. All indications showed it was recording. Didn't record a single file. Firmware 1.0.6.1 

[shadowsports]

I have notes on this topic/behavior somewhere. It might take me a little bit to put my finger on them. This is known issue or behavior. Others have expressed a desire for a more intuitive interface since the camera can be set to record on the HDMI output without anything connected.