KDE Plasma 5 dropped support for the ancient systray icon protocol xembed, which Dropbox appears to be relying on.
Would it be possible to upgrade to a newer, still working solution for the Linux systray? As more distributions upgrade to Plasma 5, things will only get worse. Thanks!
My bug KDE Plasma bug report: https://bugs.kde.org/show_bug.cgi?id=344620
The blog post explaining solutions therein: http://blog.martin-graesslin.com/blog/2014/06/where-are-my-systray-icons/
Arch Linux 64-bit, KDE Plasma 5.2, Dropbox 3.2.6
This is the same issue discussed in https://www.dropboxforum.com/hc/communities/public/questions/201896285-Top-bar-tray-icon-missing-Fed... - some potential incompatibilities & workarounds are discussed there (though nothing worked for me yet).
I'm using Kubuntu 15.04 and also affected by this bug.
See new builds e.g. https://www.dropboxforum.com/hc/en-us/community/posts/204562695-Experimental-Build-3-9-32 and workaround suggested by Nicholas O which works fine for me on Fedora 22 KDE Plasma 5
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