So I have noticed on a few occasions that there is a problem with dependencies. We have had a couple of times that during upgrades or replacements the 'Parent' object gets deleted. When going to update the dependency it disappears from the list of dependencies. If I try to recreate the dependency it will tell me that a dependency with that name already exists even though there is nothing in the list. I have to give it a new name to create it. Not sure if anyone else is seeing this also. I can see the dependency in the 'Dependencies Table' in the database, it is simply not being displayed on the settings page.
if you want to test this:
1) create a dependency
2) verify it is in the list
3) delete the parent
4) check the list again (dependency should disappear)
5) recreate dependency with the same name
6) see if error shows up.
Obviously the simple solution would be to replace the Parent before deleting the old Parent, but this still seems to be a bug to me.
Len