Presenter was unable to open project file error. By Steve Jones Hi - I'm getting this error on all my Presenter files: Presenter was unable to open this project file. Reboot your computer and try again. I've rebooted, but still get the error. I can see one project having a corrupt .ppta file but all of them? I'm using Articulate 360. Some files are old, some new. Any idea on how to fix? Thanks, Steve.