@mitya57, thank you for your comment!
Yes, it happen in Unity too. I see these small icons in all sessions in Ubuntu 14.04 - Ubity, GNOME FlashBack (Compiz and Metacity).
If gnome-panel is not affected, may be gnome-applets are affected package? I do not know package name which belongs to "Add to panel" window. If you see my screenshot: the correct (bigger) size of Ubuntu logo is in 'Main menu' applet, and the incorrect (smaller) size of Ubuntu logo is in 'Menu bar' applet. While in Ubuntu 12.04 these logos have the same size.
@mitya57, thank you for your comment!
Yes, it happen in Unity too. I see these small icons in all sessions in Ubuntu 14.04 - Ubity, GNOME FlashBack (Compiz and Metacity).
If gnome-panel is not affected, may be gnome-applets are affected package? I do not know package name which belongs to "Add to panel" window. If you see my screenshot: the correct (bigger) size of Ubuntu logo is in 'Main menu' applet, and the incorrect (smaller) size of Ubuntu logo is in 'Menu bar' applet. While in Ubuntu 12.04 these logos have the same size.