Has this happened to you?

[combatlizzy]

Not at Kingshead but this has happened to me when boarding ships, especially the bigger ones like the Navy Colussus and attacking the navy for the Black Pearl. When the lag is bad this occurence seems to increase.

[Poison elf]

Sometimes these pop up, see it more on test I think when things sometimes are glitched after a update. Only recall seeing it myself on live also on a flag ship.

Esc or one of the f keys to draw another weapon usually works.
Sometimes a walk around is to open inventory and the weapon mastered window(not weapons where you add points) and clicking a weapon there. If these and scrolling mouse all don't work you would likely have to log.