I've noticed this mostly with Excel, and the problem is intermittent.
- When emailing an Excel file from within the file (File/Share/Email/Send as attachment), a portion of the file overlays the address section of the mail message box (unable to see To, CC, Subject)
- Closing the message and trying again doesn't resolve
- No add-ins loaded / using HTML as compose message type
- This has happened to me since using OLK2013, but I've ignored it
- We have rolled out MSO2013 to all staff, and now other staff members (about 6 at this time) are complaining of the same issue