Having to go back and make sure a document uploaded the right way. Sometimes folks forget the formatting requirements (doc., pdf., etc,,,) when uploading a document or do not know how to upload a landscape document vs. portrait.
It does take a while to get used to new features after an upgrade. I did not like the change to icons on the menu bar, even though you can click on an icon for the menu words.
While upgrades are good, OnBoard seems to be catered more towards the younger generation. Our more mature executives have a harder time navigating the site. They do not like having to download a new application after an upgrade or deleting/adding a new "short-cut" on their desktop.