demobuilder.sugarcrmdemo.com's File manager no longer let's me edit files

What happened to demobuilder.sugarcrmdemo.com's File manager?
The interface up to a few days ago allowed me to open a file and edit it right there in the File manager interface. Now, files opened display the file content, but do not allow me to edit the content.
The ability to edit file content was a essential for debugging. Was this an intentional removal of functionality? Is it a defect? Is it something on my end I need to change?