opening files in Playlist

Thanks for your reponse I Am only making changes to .not files & Not Midi also all ready in a seperate folder.
The mute button is certainly staying muted some times but I have now deleted staffs I Dont need which means for example if I want to turn sax off because im playing sax I have to have to versions one with one with out the sax staff.

After reading the Forum i have learnt that you need to open files before useing them in the play list although its a real pain its more stable the changes ive made are still not what they should be when I reopen I have sent snap shots of Notaion to you.
I am only using the same laptop running vista

I have a couple of files where the drums fade in and out although when played in other midi programmes they are fine I also will send you a copy.
Notation is a G8 Program but still got a lot of bugs which I hope will be sorted one day. thanks for your help.