Folders are not writable, why?

What is the problem?
In Settings>Folders every Folder is not writable.

What did you already try to solve it?
I checked that the rights are set for pi

Logs (octoprint.log, serial.log or output on terminal tab at a minimum, browser error console if UI issue ... no logs, no support!)

2020-01-24 12:06:38,916 - octoprint.server.api - ERROR - Error while testing if /home/pi/.octoprint/timelapse is really writable
Traceback (most recent call last):
  File "/home/pi/OctoPrint/venv/lib/python3.7/site-packages/octoprint/server/api/__init__.py", line 383, in _test_path
    f.write("Test")
TypeError: a bytes-like object is required, not 'str'

Additional information about your setup (OctoPrint version, OctoPi version, printer, firmware, browser, operating system, ... as much data as possible)
OctoPrint 1.4.0rc3 with Python3 on Rasbian

Screenshot:
Settings > Folders

Looks like this might be a bug in the Py3 compatibility. Could you open a ticket?

Yes I could, and will do :smile:

'b' is for bleh...

f.write(b"Test")