We are using search head pooling, so we followed the specific instructions for dealing with that situation (ie, unpool, upgrade each head, repool).
Now, it seems that Views and Saved Searches by some of our users are showing up as having no owner.
I checked and it looks to me like the user's directory exists in $SHARED/etc/users and (as you might expect) not in $SPLUNK_HOME/etc/users
Has anyone else run into this? I did make a backup of everything before the upgrade, so if the upgrade clobbered some critical files I'm not aware of, I could replace them, I just don't even know where to start!