You've got a plugin that is trying to add more options to the menu, but has some form of security that is hiding all of its actual options from you.
There's no easy way of working out what should be on that menu. I'd have a look through the list of user-installed addons to see if there's anything in there that should be appearing but isn't.
That's a lot of plugins to work through - I'd say around a third of them might be trying to add more menu options.
I'd try a simple approach - turn them all off and see if it vanishes. If it does, re-enable them one at a time until it comes back.
However, don't disable these three - it really shouldn't be them at all. (I've got others that I really don't think it is, but I don't want to rule out bugs or updates I don't know of)
universal plugin manager
jira support tools
Now this *is* getting weird. Put all the plugins back, we've ruled those out.
Three other thoughts
1. What user system are you using? Crowd, internal, ldap, something else, etc?
2. Could you nip into "system information" in the Admin -> Troubleshooting bit and look to see what "modified files" you have?
3. The long shot - could you try ctrl-u and plough through the resulting html to see if there's anything around the "more" that might tell us something?
Sorry, I missed that last reply. Crowd doesn't fiddle with the menu so it's not that.
I'm afraid the html was spectacularly useless - Jira obviously thinks there's something else to display, but as you've disabled the plugins and it's still there, I can't imagine what.
I think this might need to go to Atlassian for investigation, it's starting to look like a bug
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