Curious behavior on «mouse over» event
You'll find a small video (screencast) demonstrating the issue. In some cases, there is a blank space on top of «configure» option, when the cursor is on it the panel content seems to jump up and down (does not look like a feature :-/). In order to reproduce all that is needed is a right click, then hover on «Cairo Dock», wait for the blank space then hover right on it.
Currently using Ubuntu with OpenBox as Window Manager (and Desktop Environment, so no LXDE)
Package cairo-dock version 3.4.1-3, cairo-dock-core version 3.4.1-3, cairo-dock-plug-ins version 3.4.1-4build1, gnome-settings-daemon version 3.32.0-1ubuntu1
Usually cairo-dock is started at session init with -o option, so in order to provide debug logs, I used
$ cairo-dock -o -l debug 1>cairo_stdout_logs 2>cairo_stderr_logs