blu-ray copy merge not working

[bkrak57]

In several of the DVDFab v9 updates, if not all, there is a button at the top between split and burn to merge in the blu-ray copy function. I have been waiting for this since I got DVDfab, so this would be a great feature for me! I am trying to merge two blurays that I have already copied as iso to my HDD, as soon as i select either iso for the source, the merge (and split) buttons disappear, and it goes to main movie mode. I believe I am doing this correctly, if not please let me know what I might be doing wrong, or if this function isn't working yet, or if it isn't meant to be included in the blu-ray version of copy (it looks like it is in the dvd version of copy). This is my first time posting so I hope I am putting this in the correct place, and thank you all in advance!

[signals]

Merge and Split are not part of Blu-ray Copy yet, they vanish because you are opening a Blu-ray and not a DVD source.