Today all of a sudden I found out that I can no longer add custom CCK fields to any of my custom content types. The right most drop down box to select the field type is now disabled!!
When I try to add to the field anyway, I get an error: Add new field: you need to select a widget. But I just can't select the widget type. The combobox is disabled.
Any ideas on why is this happening? We are running Drupal 6.22