Created attachment 788202 [details]
screenshot of lxpanel with broken nm-applet

The nm-applet background is not pained in lxpanel.

This seems to be a recent regression - was not problem earlier. However, I am
not sure what triggered the issue. I was restarting both lxpanel and nm-applet
quite often due to some communication problem between the applet and the daemon
and lxpanel crashing. Nonetheless, after reboot the background is no longer
painted. 

I am not sure if this is nm-applet or lxpanel problem. Other applets do not
show the issue but they are probably LXDE-specific and might just be
bug-compatible.