Problem or Known Issue: 

Error message(s) appears when saving a node:

  • Attachments: title mismatch. Please check your selection.
  • Files: title mismatch. Please check your selection.
  • Small Image: title mismatch. Please check your selection.
  • etc.
Why it happens: 

During the time you were editing a page, the image or file you were referencing in the small image/large image/attachments field had its title changed.

This also may result from a browser caching issue.

Solution: 

For example, if your Attachment field reads "Symposium on 1968: THE GLOBAL REVOLUTION [nid:5437]", simply remove the title (leaving you with "[nid:5437]") and save.  The next time you open the node, you'll see the new title in the Attachment field instead of the old one.

If this doesn't work, clear your cache within the browser.

This mostly seems to be a problem in Firefox. To do this in Firefox, go to Tools -> Clear Recent History. Make sure everything is selected. Warning: This will clear any saved passwords and form data.