I have the plugin displaying only on posts. When displaying on the left side, the plugin is typically showing the small icon rather than the large icon and only intermittently displays the expected large icon.
The issue seems specific to Firefox. I tested in 3.6.18 and in 5 and see the large icon only initially. On subsequent page loads, it tends to display the smaller one with only random showing of the larger.
I also tested in IE 8 and Chrome 13.0.782 and they appear to display the correct larger icon consistently.