I'm getting a similar error in http://webdiplomacy.net/board.php?
gameID=39043.
For example, I tried to set South China Sea to convoy to Indian Territory from Guangzhou. As soon as I select Guangzhou in the "from" drop-down, my browser (FF 3.6.12) freezes up for a few seconds before a pop-up appears saying:
"A script on this page may be busy, or it may have stopped responding. You can stop the script now, or you can continue to see if the script will complete.
Script: http://webdiplomacy.net/contrib/js/prototype.js:244"
I've selected continue several times, but it never seems to resolve. When I stop the script, the orders look right, but when I hit "Save", the following message appears above the South China Sea order:
"alert Parameter 'fromTerrID' set to invalid value '131'."
I thought it was maybe a bug related just to convoying across the edge of the map, but Ghana says he's having the same issue when trying to convoy into N. America. He says that all convoys are broken.
Not sure if this is just an issue with the world map...