Graham SupAlpuket The staff have been informed and are looking in to it
a solution is to put your script into a plain text file with a .js extension and then use the "local file include" xt function to add it to the page
ie my_js.js and then "include" the file my_js.js (.js files are not parsed by the building tool)
building your page like this may be better for you anyway as it allows you to use smaller blocks that are easier to edit on a mobile