Field not showing up after upgrade

I am running Drupal 5.10 and I recently updated the modules (and drupal, from 5.5 to 5.10) on an old neglected site that I've had running for a long time now.

Everything seemed to go smoothly except when I gave the pages on my site a better review the day after. I noticed that the filefields do not show up in my nodes any longer. If I go to edit my node content type, the field does not display under the Manage Fields tab, but does under the Display Fields tab. However, on the latter it does not list anything in the Type column (even though in phpmyadmin in the node_field table the missing field's 'type' is in fact set to 'file') and the Teaser and Full combos are forced to Hidden. I fired up phpmyadmin and sure enough, all my data for that field is still in there under the content_type_ table.

I read in the 5.x cck release notes (for 1.8) that there was a fix for a situation where fields would not show up if the field type was disabled. This was the case with me, because the updated filefield I upgraded to depended on another module (unbeknownst to me at the time), so it was automatically disabled by drupal while cck and others updated just fine. Now that I've fulfilled the filefield module dependency and have it re-enabled, the fields are still not showing up in cck 5.x-1.9.