Would you believe I have walked against that wall two dozen times? I still can't find the passageway at all! (The two main alcoves against the center in the right hand section have barrels (Upper) and a cobweb (lower)).
The only thing I can think is this: I was well into a game, then downloaded Trinity plug-ins. Then opened my saved games with the trinity plug-in and re-saved. It gives me a warning (using Trinity with a game started without it may result in errors).
And, if I try to open the game without trinity, it gives me the reverse error (this game was saved with trinity, it's not advised to play without the plug-in).
Could it be that this is the reason why I cannot find the passageway?
Or is just that I'm plain blind?