Hi. I have a Humax DRT 800. My codes are programmed manually into an MX-800. I have been using the unit (and universal remote) for several months with no issues. Out of the blue last week, the Guide button no longer works. I just get the thumbs down error sound. I tried using the real Humax remote rather than my Mx-800 and am experiencing the same error. Was there a recent software upgrade with a bug? Haven't seen any other posts, so perhaps it is just me. Any help is greatly appreciated.