Drupal 7.41 Civi 4.6.9
I've inherited this site recently and see an issue with custom field profiles that I haven't seen before.
Custom field set is tied to contacts with corresponding profile.
When editing the custom field set from the contact page, edits are saved correctly.
However, when I edit them from the profile, nothing is saved.
There are no errors that I can see in any logs.
I've cleared the templates_c folder to no avail.
All users have access all custom data permission.
After more research, if I add a built-in Civi field (like last name) to the profile and edit it, the last name edit is saved but no custom field data is saved.