fusermount: user has no write access to mountpoint /keybase

Hi,
On one of my devices (twiggy), I can't use the kbfs folders, but I don't encounter this problem on the other one (turkana).

On both devices, I'm running Archlinux and the keybase-bin from the AUR repositories. keybase version is:

Client:  1.0.17-20160920160056+1e8543e
Service: 1.0.17-20160920160056+1e8543e

In the keybase.kbfs.log I can read that it's a permission problem:

2016-09-21T08:22:39.137510 ▶ [INFO kbfs start.go:27] 002 KBFS version 1.0.2-20160920160056+7ab3317
2016-09-21T08:22:39.137556 ▶ [DEBU kbfs main.go:107] 003 Mounting: /keybase
2016-09-21T08:22:39.141594 ▶ [DEBU keybase login_state.go:889] 004 + LoginState: Running request loop
2016/09/21 08:22:39 mount helper error: fusermount: user has no write access to mountpoint /keybase
2016/09/21 08:22:39 mount helper error: fusermount: user has no write access to mountpoint /keybase
kbfsfuse error: (2) fusermount: exit status 1

First, I checked the permissions of the /keybase folder and set them to drwxr-xr-x 2 root root. I've also checked groups igor (who is my user), but saw no differences between the two devices.

my log id: ae0f5adba3e47177cca2c71c

Start with keybase.kbfs.log and the reported fusermount error, then compare the /keybase permissions and group membership on twiggy and turkana. Done means identifying why the affected device rejects the mount and confirming that KBFS mounts successfully for the user.