OK lets try this again.
I am NOT saying that the Stealthing skill has changed (i.e. the chance to succeed, distance between skill checks, what you can wear at what skill level).
I am NOT saying that the problem I am having is affecting everyone else, but since I saw someone post with what appears to be a similar problem I posted in this thread.
Unlike the OP I am NOT getting any type of get off your mount message.
I believe my specific char is bugged and it appears that at least one other person has an issue so since only a small minority of players post on Stratics there are probably more people who have run into stealthing issues.
The bugged char has (well had now) 100 hiding.
I tried each of the below and the char always revealed on the first step. Each of the below was tried in several locations with no PCs or NPCs around (and then with a few on screen just for the heck of it) including my house, cities, woods, at a shrine and in a dungeon, all with the exact same results.
Naked, used hiding skill then attempting to walk.
Naked, used Ninja form that increases stealth, used hiding and attempted to walk.
Naked except for items that increase Stealth, used hiding and attempted to walk (note I did not take off the items to attempt to walk).
Naked used hiding skill then actively used stealth skill then attempted to walk.
Naked, used Ninja form that increases stealth, used hiding, actively used stealth skill than attempted to walk.
Naked except for items that increase Stealth, used Ninja form that increases stealth, used hiding skill, actively used stealth and attempted to walk (note I did not take off the items to attempt to walk).
I was not on any type of mount at any point during the above.
The only time I gained steathing skill was when I actively used the skill (and prior to taking a step).
I actually had someone standing over my shoulder watching me do these things because they believed I was either missing a message or some other explanation for what was happening.
I tried the suggestions made in prior posts and nothing fixed the issue.
Moved the skills over to a new char and everything works fine now so it was not my account that was bugged, just that char.