Could you check the log file to see what it's actually doing?
Also, could you nip into Admin -> Licence and see what it is now reporting your licence as? (Sometimes, I've found Jira can go a bit quiet - it looks like a screen is just churning, but the process has worked fine behind the scenes)
You user count is based oin your license, if you bought a new license for 15 users, you can follow this article to change it: https://confluence.atlassian.com/display/JIRA/Updating+your+JIRA+License+Details
Hope it helps,
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