I've looked in other topics but don't see this one yet. 6D, manual lens, live view I get the "RAW error, falling back to YUV overlays." Also, in live view, when I push shutter button or AE-On, the live view automatically magnifies. This only all happens in live view. Canon firmware is up to date. Any ideas?
Assuming it happens when you take a picture. Does the error also appear outside LiveView at the same settings?
Yes -> upload a CR2.
No -> record a video of your camera screen (and, just in case, upload a CR2).
A similar error appears on 500D; in LiveView, Canon code may overwrite the raw image buffer, IIRC depending on how long you keep the shutter button pressed after taking the picture.