Well, I've finally got it sorted. Messiah kindly sent me his CCF on which everything worked apart from the yellow button again. So, in desperation I tried learning the button again and incredibly it now works fine
I had a similar issue last night with the TV volume+ key on a TSU3000 PCF I was creating last night. Took 5 attempts to get it working. I often find the best way to learn the codes is to use 2 short presses rather than one long one. Out of desperation I will often revert to using Tonto which does a compare of 2 captures. Why on earth Pronroedit does not learn from that and implemenmt a similar checking procedure I will never know.