event handling broken

[nbi1]

The click, mousedown, mouseup event handling seems to be broken in FireFox and Chrome. Events are successfully processed for an arbitrary number of moves, but then the board becomes unresponsive to clicks. I used the JQuery binding technique, i.e. $("#board1").on("click", clickOnBoard); Should this be done differently? Could JQuery be the root cause of the problem? I monitored the Browser console in FireFox and did not see anything that might be a clue.