I'm guiding users through the process of setting up terms in their vocabulary for a specific purpose, so I edited the help text on the screen (by editing the module). I have four sites running from the same install. The edited text appears on two of the sites, but on two it simply does not appear.

Site A (one where it does appear) even has the same theme, so it's not a stylesheet-hiding situation. (and the text is not in the source code).

I checked that the help module (or advanced help module) is enabled -- for all.

I'm at a complete loss, any ideas?