Thanks Konstantinos! this fixed the Spotify icon for me.

2010/6/5 Konstantinos Natsakis <email address hidden>

> I believe this bug is somehow related to a change in gnome-
> panel_1:2.29.5.1-0ubuntu1 when the building of applets as shared
> libraries was deactivated (they are now build as standalone executables)
>
> Changelog:
> http://changelogs.ubuntu.com/changelogs/pool/main/g/gnome-panel/gnome-panel_2.30.0-0ubuntu1/changelog
> * debian/rules:
>    - don't build in process applets during the unstable cycle so crash
> issues
>      should be easier to debug and reported on the corresponding binary
>
> It seems to me that due to this change, the notification area icons get
> the background of the program's main window instead of the panel's
> background.
>
> Compiling gnome-panel with '--with-in-process-applets=notification-area'
> in debian/rules (and no other changes), fixes this bug for me.
>
> I have uploaded modified gnome-panel packages to my PPA:
> https://launchpad.net/~cyfex/+archive/ppa in case others want to try
> this (you need gnome-panel and gnome-panel-data; killall bonobo-
> activation-server and gnome-panel after installation)
>
> --
> Notification area icon wrongly rendered/uses bg_color as a background
> (multiple apps)
> https://bugs.launchpad.net/bugs/403135
> You received this bug notification because you are a direct subscriber
> of a duplicate bug.
>
> Status in AllTray: Fix Released
> Status in aMSN: Confirmed
> Status in AMule: New
> Status in Banshee Music Player: Confirmed
> Status in Beagle Desktop Search: Confirmed
> Status in a fast and powerful GTK+ based mail client: Unknown
> Status in Desktop Drapes wallpaper managment.: Fix Released
> Status in FileZilla FTP Client: Confirmed
> Status in firestarter: New
> Status in gmusicbrowser with now-playing support: New
> Status in Mail Notification: Confirmed
> Status in Pidgin: Fix Released
> Status in Quod Libet is a GTK+-based audio player written in Python.: New
> Status in VLC media player: Fix Released
> Status in Wine: Confirmed
> Status in wxWidgets crossplatform GUI toolkit: New
> Status in Ubuntu: New
> Status in “alltray” package in Ubuntu: Confirmed
> Status in “amsn” package in Ubuntu: Confirmed
> Status in “azureus” package in Ubuntu: Fix Released
> Status in “banshee” package in Ubuntu: Triaged
> Status in “checkgmail” package in Ubuntu: Fix Released
> Status in “claws-mail” package in Ubuntu: Confirmed
> Status in “filezilla” package in Ubuntu: New
> Status in “gajim” package in Ubuntu: New
> Status in “gnome-panel” package in Ubuntu: Invalid
> Status in “gxneur” package in Ubuntu: Confirmed
> Status in “openoffice.org” package in Ubuntu: Confirmed
> Status in “pidgin” package in Ubuntu: Fix Released
> Status in “vlc” package in Ubuntu: Confirmed
> Status in “wine” package in Ubuntu: Won't Fix
> Status in “wine1.2” package in Ubuntu: Triaged
>
> Bug description:
> The following bug may possibly depend on my setup, if so just tell me how
> to check this. I am using banshee 1.4.3-5 (in ubuntu karmic) and its
> notification area icon has a black background, unlike other applets that
> have a transparent background.
>
> I attach a screenshot.
>
> This bug is noticed when:
> a) Themes set a background image in the gtkrc
> b) If users set a custom image for the panel from Panel Properties >
> Background > Background Image
>
> ***This bug affects all themes , but has become easier to notice since the
> default light-themes use a background image.***
>
> Also , see , comment #99 , might be a regression in gnome-panel since
> Karmic release.
>
>
>
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>