Hi
I have had this problem on my Genos, it seems to occur with midi files that might be commercial and locked in someway.
To get round this I load the midi file into the multi midi recorder, go into step mode, do nothing except press execute,
then save midi file as a new name.
then work with this file.
In the past the have been unable to change drum kit , to say the Revo drums, it goes straight back, but after doing this it seems OK.
If just pressing execute isnt enough, try actually changing something, then change back, then save
regards John