I'm really trying to remember the context, I wish I'd written it down somewhere. But now that I'm thinking of it, I'm almost certain it wasn't PDFs, but JSON files that I'd written. For some reason it would allow me to open them in some applications, but in others I'd get a warning and the file would be trashed.

The Docker thing happened as described in my linked post. It happened with something else too, but again I can't remember. I wasn't planning on doing a post mortem so I guess I let the details slip!

In any case, I do like most of the OS' ways of doing things, including security. But it can be overzealous.

P.S. I'm not crazy! I'm not crazy!!!