tested with Ubuntu 12.04
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It seems that Unity has a whitelist for programs that can add indicators. Please take a look at this link.
Thanks for the link. That should be the reason.
This isn't possible anymore on Ubuntu 13.04, it would be possible to support Ubuntu's own "systray"(AppIndicator)?
See http://developer.ubuntu.com/resources/technologies/application-indicators/ for more technical information
There is a working pull request for this:
This should be working with latest version now.
In 0.13 we changed to an optimized architecture so more features can be supported, see http://nwjs.io/blog/whats-new-in-0.13/ and it's good for keeping up with Chromium upstream -- we released with Node.js v6.0 and new Chromium versions within 1 day after upstream release.
The new version would fixed many issues reported here and we're scrubbing them. This issue is closed as we believe it should be fixed. Please leave a message if it isn't and we'll reopen it.