When copying content from a Rally ticket (or other location with markup) and pasting into Jira, users are unable to save the pasted content.
It seems to occur when any content that is copied cannot be fully resolved because the location is behind a secure location.
Eg; URL is in a test region
or an image is served from a location that requires credentials to access the image location.
This may also be related to the broken URL resolver is trying to resolve or display inline and cannot resolve. aka smart links.