I admit it - I am a clueless/brainless (your preference here).
I carefully followed the 'for dummies' tutorial from the 'Remove Track Numbers From Titles and Filenames' posting. Even copy and pasted from example number(s) 1 and 3, as they are applicable. The results? 'Formatting' pop-up counts down, and...
Absolutely nothing happens. After several attempts, on two different devices (same collection of .mp3's). So. Why do I remain the genus Capra...
It is rather hard to come up with any kind of suggestion as you tell very little about where and how you try to deal with the numbers.
Perhaps this thread helps you to elaborate a little more: