When I tried using this on my work computer I also couldn't run anything. Everytime I entered the filename and pressed enter cursor just skipped to next line instead of causing the file to be loaded. It works OK on my home computer.
Based on the fact that our work computers don't have updated software on them (don't ask me why) I suspect that this might be related with which version of JavaScript is supported by your browser.
Now I don't have acces to the work computer at the moment, but if you need I can post some more information about it when I get back to work tomorow.