I am trying to upload code to the arduino to control additional sensors, however when I open the Cloud9 IDE and try to open files the screen is blank. There is a new tab with the name of the file I try opening but underneath is all grey. This happens with every file not just arduino files. Any help would be appreciated.
I had this same issue. In my case it only happens with Chrome (it was repeateable on both Windows and Linux with Chrome). I tried Firefox and it works well. You can see the files, edit, save, etc.
As a heads up, if you wanted to go completely with Firefox, the video of the Cockpit did not stream using Firefox. At least that was the case for me.