I have this issue but that particular plugin is not installed in our system.

[M]

This question is in reference to Atlassian Documentation: Attached image files not showing on IE

However, we do have a Spartez plugin called "Agile Poker for JIRA" but it doesn't have the module listed.  I'd like to know if there is a workaround I can use.  This occurs when we right click an image and copy it, then paste it into the Attachment section in JIRA 7.0.10 (It is a .png file).  However, it works correctly if we use the "Snipping Tool" that comes with Windows 7, which also creates a .png file, and we paste that in the Attachment section, that one expands fine when you click on the image in the Attachment section.  Whereas the other way, you click on the image, and the little error box pops up so you can't  expand the image to see it better. 

[M]

Update to the above, this occurs in IE11 only.  It works in Firefox.  So I guess it is a browser issue.  Would be nice to know if there is an IE setting I can adjust.