As we have already said, more than a few times: Photoshop does more error checking than most other applications, because we've seen so many odd errors in the past and don't want customers to lose files to those odd OS errors and minor system configuration mistakes. If it was not a permissions error coming from the OS, then Photoshop would not be telling you that there was a permissions error. But the OS says that there is a permissions error, and Photoshop informs the user about that error that it got from the OS. And files vanishing is something else entirely - there was a MacOS bug like that, but we spent a lot of time figuring out how to work around it while waiting for Apple to fix the bug in the OS code. Also, shouting is not helping.
... View more