#1064 Control key stuck on MPlayer when using SetHead keybind

[spyroboy]

Fluxbox Version: 1.3.2
MPlayer Version: SVN-r34799-4.6.3

I have two SetHead binds in my keys files.

Control Mod4 1 :SetHead 1
Control Mod4 2 :SetHead 2

In my MPlayer configuration, I have click set to pause/play.

I frequently use these binds to move my MPlayer instance from one display to another. sometimes just to view a window under my MPlayer instance and switch it back.

when I do this and I try to unpause MPlayer by clicking on it (as per my MPlayer configured keybind) MPlayer complains that control + left click isn't assigned as shown below.

No bind found for key 'CTRL-MOUSE_BTN0'.

I've deduced that this could be a bug in Fluxbox because when I use my StarMoving bind (shown below), it resets the stuck control bind and I'm allowed to unpause my MPlayer normally without error.

OnWindow Mod1 Mouse1 :StartMoving

I'm not entirely certain and convinced that this is a Fluxbox bug but I don't know how to debug it otherwise.

thanks.