All the value lists are visible and working on the layouts but when you to manage the value lists their are zero listed for editing and deletion.
If I add a new one in the manage value lists dialog box then it will show the new one and remove all existing drop down menus on the layouts and
they will say no value list after that.
I actually went through all of them and re-added the values lists (50 or so) and after about 2 weeks the value list dialog manager is blank yet again.
If I add an New Value List to my solution I will lose all my drop downs again.