Symptoms

After upgrading JIRA, some fields will display only some unformatted code in the "Create Issue" screen as shown below:

Cause

Some field .vm files have not been properly upgraded during the process and are somehow corrupted.

Resolution

To fix this problem you will have to replace all the content from one JIRA folder for the default one (which comes bundled with JIRA). This will have to be replaced for the same JIRA version you are running. For example, if you have upgraded to JIRA 6.0.4 and you are now facing this problem, copy the content from a new JIRA 6.0.4 as well to replace.

1. Shutdown JIRA;
2. Copy all the default content from the following location (from a new, clean JIRA install):
   atlassian-jira/deployments//current/exploded_war/WEB-INF/classes/templates/jira/issue/field/
3. Browse to the same location above in your current JIRA installation (which you are facing the problem), and replace all the current files with the ones copied above;
4. Start JIRA;
5. Reindex JIRA;