Try these steps (in order of extremity), and stop once the problem becomes resolved.
- Opening the database from another client or even directly from the server's client. If the documents are visible, it is most likely a local Notes client cache problem. Delete Cache.dsk.
- Rebuild -- locally -- the view from the Notes client ([Shift] + [F9]).
- Rebuild -- locally -- all the database views ([Ctrl] + [Shift] + [F9]).
- Run Fixup on the database.
The one issue I have with your question is that "several" of your users are experiencing this problem. If this is the case, and the users are all located on the same home server, I would be taking a good look at the mail template on that server to make sure there aren't any corruptions in the design elements in the template.
Dig Deeper on Lotus Notes Domino Administration Tools
Related Q&A from Mathew Newman
SearchDomino.com Sametime administration expert Mathew Newman explains-step-by-step how to enable communication between multiple Lotus Sametime ... Continue Reading
A Lotus Sametime user is online, but no one can see her. SearchDomino.com's Sametime administration expert Mathew Newman expert explains how to ... Continue Reading
I have a questions about Notes client connection documents. In the Advanced tab under Destination server address, what are the pros and cons of using... Continue Reading