Vault unlocks and assigns drive letter, but later the drive cannot be opened

In general, dokan1.sys is removed from the system if you uninstall Dokany and perform a reboot. The other way is to use the troubelshooting dialogue and load a seperate, slim Windows from where you can change files in your normal windows:

  1. Ensure that Dokany is uninstalled and you already tried the reboot solution
  2. Open the troubelshoot dialogue by entering the power menu, hold the key Left Shift down and click on Restart
  3. From there click “Troubleshoot”, “Advanced Options” and finally “Command Prompt”
  4. You may have to authenticate yourself, but after a reboot a Windows command prompt opens
  5. Now you need to delete the driver file. But you may need to try out different drive letters, because your actual Windows does not need to be mounted on C and you may hit the drive letter where the currently running, slim Windows is mounted. Hence, for the letters A to Z try out the following command where [$] needs to be replaced with a drive letter:
del [$]:\Windows\System32\drivers\dokan1.sys`

I advise against such clean ups, see here.


Okay, if everythings sober on the system again, there is currently only one thing I can say: You are not the only one, see e.g. Autostart working but mounting of drives fails (without an error message) - #3 by mary-lou. According to your log files, the vault is mounted. But maybe not correctly integrated into the system. You can try to remove the the flag CURRENT_SESSION and see if this changes something, but be aware of the its implications:
Cryptomator on Windows: Accessing your vault with admin priviliges