Firstly, I've been using music notation software since 1994, bought my first Mac in 1988, am a veteran of PhotoShop, QuarkXPress, Illustrator etc. and I'm used to problem solving, at least, I thought I was until I tried muting and un-muting brass mutes in MuseScore. (It would be useful not to assign two entirely different meanings to the word 'mute').
My current score has an 'open' staff throughout the whole score sounding muted for some reason. A bar that is filled with muted brass 16th notes all sounds muted OK except for the last 16th note in the bar which sounds 'open' and absolutely will NOT respond to corrections, no matter how many times I try or how many times I visit online help etc. Indeed, when I go back into the box to check 'muted' again the command disappears each time. I have two bars of tied notes which are muted but the sustained note changes to sounding 'open' half way through!!
This is a 1.3 score that I've opened in 2.0 and I'm using General User GS museScore v 1.442 rather than the shipped font, which I don't like.
There are many other problems with font sizes and alignment etc. that seem to involve compatibility issues. I never, EVER blame my tools for my own shortcomings but life really is too short for all this.
Any advice would be welcomed, John Morton.