After the release of Octoprint 1.3.9 on Friday, I flashed a new SD card with the new release to try to get around the problems with the PIP. After loading, updating, upgrading, and installing plugins via a working Plug-in Manager. Upon reboot, however, the Octoprint had reverted to 1.3.8 and the Plug-in Manager no longer works.
Prusa i3 mk3 (up to date as of today), Raspberry Pi 3B+ with 7" touchscreen. No idea of which logs to include... or serial log (where it is located?)
Additional information about your setup (OctoPrint version, OctoPi version, printer, firmware,
serial.log or output on terminal tab, ...)