'Diagram' mode for editing Workflows doesn't work.
STR:
1) Click 'edit' workflow (it does not matter active workflow or not).
2) Switch to DIAGRAM mode.
ACT: Diagram interface does not appear.
EXP: Diagram interface should work.
NOTE:
It's happened after last Jira upgrade,
and NOT connected with the absence flash plugin and incorrect browsers work.
I have the latest Flash Plugin version and tested with all browsers and on the several PCs.
Community moderators have prevented the ability to post new answers.
Same issue.
Jira v5.1.7
Flash 11.7.700.169
All lastest browsers 
/s/en_USnk2p2x/786/5/_/download/resources/com.atlassian.jira.plugins.jira-workflow-designer:workflowdesignerflex/flex/jira-workflow-designer-flex-2.6.13.swf
Response body: 0 bytes
[Full size image]

hi maxim
can you take a look at the webservers logfile?
grep for something like
plugins/servlet/jwd/amf/
lets check the errorcode the apaches shows
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