You left out one word in your post... Between the word "no" and the word "changes" should be the word "intended".
You won't convince me, or many other players, that there have been no changes... They are far too apparent to people who do vast amounts of them. I'm not trying to pick on the Dev teams programming skills here, but we have lots and lots of bugs in UO, so unless you're telling the players that you have added them all intentionally, then we must assume that sometimes changes have unforeseen consequences.