I am running LXDE+Openbox on Ubuntu 18.04.1 LTS with Lubuntu installed.
When I click on the client-menu icon, or right click on the titlebar, the client menu opens far to the left of the mouse cursor. It is always a fixed offset from the mouse cursor, about 2/3 of a monitor width. (Unless I on the leftmost monitor, then it appears at the far left edge... never offscreen.)
See attached image for an example. The image shows the mouse cursor over the client-menu icon, and the client menu's actual location offset far to the left.
I would expect this menu to popup at the cursor position.
Is this some configuration I accidentally set, or some incompatibility with other software, or a bug? Any idea how I can fix it? I am very happy with Openbox otherwise and don't really want to switch to a different window manager.