Hi Wayne Posner,
I haven't encountered this but by looking at the error it seems that Permission to access the directory/file by the tomcat user is missing. Here the directory refers to the folder where files to be encrypted are placed.
I hope it helps.
It's definitely permissions. But what doesn't make sense is that the extension is using TWX open and write APIs to read a file from a repository, encrypt it and then write it back. I've checked the folder and it has all the correct permissions and all the files inside the folder have matching permissions. The extension just can't create new files for some reason. I wonder if PTC doesn't set up their cloud unix boxes with the ACLs in place for extensions to have the correct write permissions.