mimlay

Everything resolved. In case others using Yahoo web hosting have the same problem, you’ll find the answer here:

https://tonyadam.com/blog/updating-permalinks-when-moving-to-wordpress-25/

Installed the disable-canonical redirects plug-in, re-fired up the Yahoo pretty permalinks plugin, and it worked like a charm.

Oops. I guess it’s always good to search the forum database first. Sorry.

I disabled the Yahoo “pretty permalinks” plug-in and reset to the WP default. Now all the permalinks work again.

I’ll be searching for a new plug-in compatible with 2.5.1.

Got it. Thanks, everyone, for putting up with a code newbie. I’ll remember to search the codex next time. ??

Thanks haochi — I’ll check into the plugins and replace the php code. Forgive me being clueless, but what’s that particular string of code for?