We have found that mojoPortal offers no protection if two users edit the same content at the same time; the second user to save overwrites the first user's edits, without any way of knowing. This is a fairly high risk of this on some of our sites with multiple authors collaborating on projects.

I think two things could be done to improve this.

1. warn a user if another user has already started editing the feature. I appreciate that in stateless web apps there is no way of knowing whether that user will go on to save or abandon their edits, but this would still be a useful warning. For example when I start editing an html content feature, I might get a message "User xxx started editing this feature at yyyy-mm-dd hh:mm:ss" (proceed or cancel). There would need to be a way of cancelling out edit-starts that went nowhere; for example each successful save scrubs any old starts, as they are no longer relevant.
2. detect on saving whether the record has been changed since the current user started editing. If it has, display the comparison, as can be done in the history of past edits, and allow the user to choose whether to proceed or cancel, and which version to save (plus scrape content to clipboard etc).

These two strategies together would prevent against accidental loss of content.