Yeah, it looks like a bug. The avatars are behind a log-in page. On the web you are most likely logged into JIRA already that's why the avatars are shown. In the desktop clients it is not the case.
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I agree. Either:
1) provide an option in JIRA to allow unauthenticated access to the avatars
or
2) have HipChat proxy access to JIRA (given JIRA already trusts HipChat)
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This matter is publicly tracked here: https://jira.atlassian.com/browse/HCPUB-1594
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