Created attachment 7338 screenshot I had a similar problem with another plugin, after update it started happening with whiskers as well. Not sure if it's not a global bug (like in panel or one of the libs), but it only happens with two plugins. Icon appears to be twice the panel size (see screenshot). I have scaling set up with following settings: $ env | grep SCALE\\\|RATIO GDK_SCALE=2 GDK_DPI_SCALE=0.5 QT_DEVICE_PIXEL_RATIO=2 and 192 DPI. Versions: xfce4-whiskermenu-plugin/zesty,now 2.1.3-0ubuntu1~17.04 amd64 [installed] xfce4-panel/zesty,now 4.12.1-1ubuntu1 amd64 [installed] libxfce4panel-2.0-4/zesty,now 4.12.1-1ubuntu1 amd64 [installed] libxfce4ui-1-0/zesty,now 4.13.1-1ubuntu1 amd64 [installed] libxfce4ui-2-0/zesty,now 4.13.1-1ubuntu1 amd64 [installed] libxfce4ui-common/zesty,zesty,now 4.13.1-1ubuntu1 all [installed] libxfce4ui-utils/zesty,now 4.13.1-1ubuntu1 amd64 [installed] libxfce4util-bin/zesty,now 4.13.1-0ppa1~17.04 amd64 [installed] libxfce4util-common/zesty,zesty,now 4.13.1-0ppa1~17.04 all [installed] libxfce4util7/zesty,now 4.13.1-0ppa1~17.04 amd64 [installed] Packages are from Xfce4 Ubuntu PPAs (zesty/17.04).
Might or might not be related to similar pulseaudio plugin bug https://bugzilla.xfce.org/show_bug.cgi?id=13894 (it was happening all the time though, while with whiskers it's new after upgrade)
Graeme Gott referenced this bugreport in commit e9944243454b39e9e50f5d64e0599e8306bba52f Fix panel icon too big with high DPI. (bug #13893) https://git.xfce.org/panel-plugins/xfce4-whiskermenu-plugin/commit?id=e9944243454b39e9e50f5d64e0599e8306bba52f
Fixed in e994424.
Closing as fixed.