I've been having this exact same issue when attempting to sync non-empty R/W folders as well. The GUI is also non-responsive when trying to "Update key" through the preferences menu (no error messages).
Running a Raspberry Pi B with the latest version of Raspbian.
Linux: Can't Add Non-Empty Folder With Existing (Read Only) Key
in Sync Troubleshooting
Posted · Edited by joshk
I've been having this exact same issue when attempting to sync non-empty R/W folders as well. The GUI is also non-responsive when trying to "Update key" through the preferences menu (no error messages).
Running a Raspberry Pi B with the latest version of Raspbian.