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Someone has fixed this problem?

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This happened to me when I switched from dropbox2 to dropbox3 in XFCE4, also. I had an icon theme applied (Faenza) that has darker, nicer icons which weren't being listed. Turns out that I had to enable display compositing. In XFCE it is under Window Manager Tweaks in the settings. I assume LXDE will have some sort of ability to enable display compositing somewhere.
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I have the same issue, it is really annoying. Using a compositing manager makes no difference. There's a bunch of packages in the aur for changing the dropbox icon to suit a dark theme but they are all ancient and don't seem to have seen updates since 2012 or something.
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