I believe having reproduced the bug, actually, but it doesn't reproduce easily. It seems to be a race condition, it can be both in GTK+ and the notes plugin. The cause can certainly be the theme, since GTK+ and theming are two things that don't fit well, but I can't change anything about this.
The solution is to simply stop / restart the plugin.
Sorry, I cannot help further.
I believe having reproduced the bug, actually, but it doesn't reproduce easily. It seems to be a race condition, it can be both in GTK+ and the notes plugin. The cause can certainly be the theme, since GTK+ and theming are two things that don't fit well, but I can't change anything about this.
The solution is to simply stop / restart the plugin.