What's "symptom 4"? What docs are you reading?
What version of JIRA is it, and what do the log say?
Please refer to the following article in the knowledge base: https://confluence.atlassian.com/jirakb/jira-login-fails-with-user-exists-but-has-no-unique-key-mapping-373261121.html
You will see that for sympton 4 there is no fix described.
Right, there was no way of knowing what you might be reading. Thanks for the link.
There is a fix - follow the link to the bug. You'll find it is fixed in there.
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