java errors with Game Explorer

I often have several tabs open in my browser, each with a Game Explorer that has been setup to follow the progress of multiple games I am playing. However, when I come back after a while to one of these explorer windows and try to use it, I very often get a message saying there has been a java error and a new popup window will be created. So a new window opens with the Game Explorer, but it is reset back to the starting game position. The only way I can use the original tab is to refresh the window, which also resets the game, and then I have to click through all the moves again, which is quite tedious.

Is there a way to work around this problem? Is it a known bug? I use Chrome, does it happen with other browsers? Thanks for any help.

I also get this using firefox.