Do it off-line.
i.e. Write your problem on your own computer using the editor of your choice.
When you are happy with the global changes upload it to your construction space.
If you need to make changes to an existing problem, you could "download" it to your own computer for this purpose. Personally I'd do it by viewing the problem in the xml editor in CSTR and then copy and paste the txt from that frame into the local editor.
Currently files in an author's construction space, created through the web browser, are not owned by the author and there is not group write permission set. So they can only be edited by the author through the browser.
If there is a more satisfying answer to this question, I'd like to hear it.
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