I'd created a custom column on a document library using the settings > create column menu. We used to be able to specifiy the value on this custom column when uploading a file or by going to the 'edit properties' page and changing it there.
Suddenly, the ability to edit the value has gone. It no longer appears on the upload or edit properties pages. I can still see the column in the default library view and can edit the values using the edit in datasheet option.
Does anybody have any idea what might have been done to remove this functionality, and how to restore it?