Chess pieces get stuck

Have you noticed that in every game, there is always a chess piece that you can't move.  This is so frustrating, because sometimes it can take up to a minute to move the piece.  I have to keep pressing on the piece and its destination square up to 50 or 60 times, before the piece moves.

I think the system administrators should do something about this.

Is there a way to rectify this problem of chess pieces that get stuck?  Like, can we use the keyboard instead of the mouse to move the chess pieces until the computer technologist fixes the problem?

Are you by chance using Chrome browser? And do you have any addons/extensions on the browser?

I"m using Mozilla Firefox, but I have a LInux system.  I"m  using Kubuntu.  Not sure which version....probably 11.04.  I've been trying to update my Java for like 5 months.  I"ve tried everything...nothing works.  So I"m using an old and insecure version of Java.

Live chess doesn't use Java.

Try reloading page when pieces get stuck; they unstick !