[mdevour]

D'oh!

And if I hadn't read past the line in construct_forum_bits() that calls fetch_last_post_array(), I'd have been able to find out where $forum was defined by looking up fetch_last_post_array() in the Code Documentation, which would have gotten me to look in functions_forumlist.php again, about 3 screenfuls above where I was at already. <sigh>

Okay, now I just have to study build_forum_permissions() to get my bearings on what they're putting in the cache.

This is excruciating.

To answer such questions yourself, you have to track down the data flow.

You're absolutely right. Thanks, Andreas.

Mike D.