I am using Umbraco 7.4.3 I have made changes to two different nuPickers property editors used in 2 different document types. The changes take effect and when I edit content the modified property editor works as expected. Then the following day my change to property editor is gone, and it has reverted to previous settings.

The 2 most recent changes that had this problem were:

1. edit nuPickers: Lucene PrefetchList Picker and set "Allow sorting" to be checked I submit the change to Editor Settings, and Property Settings and get the "document type saved" confirmation after saving the doc type

2. edit a different nuPickers: Lucene PrefetchList Picker "Min items" value was set to 1, so that this field was required, and document could not be saved without selecting at least 1 item in nuPicker

Change "Min items" to 0, so field is not required. Again I submit Editor Settings, and Property Settings, and save Document type.

I did previously create a package that included this Doc type to migrate changes from DEV environment to Production, but I am making above changes direct on Production.

any help or pointers appreciated.