Hmm… Well, I can’t find a folder named “tag” so far as I can tell, but I changed the tag base to “tagname”, cleared the cache (which I hadn’t done last time) and everything’s good. Perhaps there is a “tag” folder buried in there somewhere. I’m not sure I completely follow the multi-user directory structure. In any case, it works. Thanks much.
Ok, reading some previous forum entries, it appears that I need SMF 2.X, not the current released version – so I’ll try that out. (A hint was that the Security.php mentioned this redundant function would be removed in version 2.0)…