When the following conditions are met:

• Idle-session expiration is enabled (I get automatically logged out after a some period of time)
• Such an amount of time has elapsed
• I have a jira incident open in my browser

And I do the following:

• Click Resolve Issue in the left bar

Then:

• I get a system error. (bummer!, but of course logging in fixes the problem)

Other links:

• Assign: System Error
• Attach File: Permissions
• Screenshot: window comes up OK, did not try to attach
• Clone: Sysem Error
• Comment: Permission error
• Create sub-task: Not-logged-in message (yeah!)
• Delete: Permissions Error
• Edit: System Error
• Link: Permissions Error
• Move: System Error
• Vote: System Error
• Watching: System Error

I believe that all links should return a "not-logged-in" message.

Thanks!
Darren.

Some additional details:
URL: http://HOST/secure/WorkflowUIDispatcher.jspa?id=10030&action=5
Referer URL: http://HOST/browse/INCIDENT