[SOLVED] Where are post-category names/links stored?

Just moved entire blog to a new domain. Everything working (I think), except: clicking on a category label in the left sidebar sometimes (not always) brings up the login screen for prior, passworded site. I've searched most of the code in both cPanel file manager and Atahualpa code editor for the strings OLDDOMAINNAME and THATCATEGORYNAME. Found neither. Where is this info stored, please? I want to correct the bad page data or link or whatever it is that was imported by mistake.

Thanks very much-

Ctenos