actually i have the same issue... also the problem with CTRL U O B R... and before i also have that problem under the Script Editor...
someone told it is posible is something with winXP... and someone told me to play around with [Control Panel] -> [Regional and Language Option] and go to [Language] and [Advance] tabs... after playing with the settings... the issue disappeared only to the script editor... however still have it with my any chan or query text box...
