EDIT: We managed to fix it, we discovered that for some reason we were missing the Library_pre and Library_Fav folders from our @inidbi\db\xcam directories.
Me and another person from my group have problems with saving prefabs.
When we create a prefab named 'Test' for example, we get an error saying "Favorite file 'xCam\Library_Pre\Test' not found.". A prefab named "Test" does appear in the prefab window however. When we try to save it we now get the error "File Test.ini not found.". When we try to save again we just get "File .ini not found.".