>So it seems Premiere lost all write functionality to projects...
PPro never alters OS-level user permissions, or storage read/write access. The fact that no one else has reported this problem, and that thousands are using the same beta build without issue, makes us hopeful that the problem is specific to your system... Confirming: You see this access failure in independent projects, not just projects within a Production, yes?
Confirming: Same behavior, when attempting to save on local drives, or network drives, yes? Confirming: Same behavior, when attempting to save to your OS User's home directory (to which you're pretty much guaranteed to have write privileges), yes?
Are you perhaps logging into that editing system, with a different OS User account (with fewer privileges)? What else might have changed about your system, between the last time you were able to save PPro projects, and now?
... View more