I cannot save files..All files open as read only

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Message says you don't have permission to save in this location. Contact administrator to obtain permission. I have no administor.

All files open as read only.

Everything worked fine until today. Downloaded 7.0 and no change. Still can't save files and all open read only. I have the Libre data files backed up on a thumb drive. I can open files from and save them to the thumb drive with no problem.