Hello again. There wasn't a problem with commas in my pam-encfs.conf file. I can replicate the command used during login in the terminal and it works fine (the verbose messages are exactly the same). It seems like fuse is failing somehow but I don't know how to record the error message it gives (it doesn't appear on screen). Is there anything else I can try to pinpoint the problem?

attach your pam_encfs.conf file.

Here is my conf file. Thanks again for taking the time to help me with this.

Archlinux has changed from using util-linux-ng to util-linux and now everything seems to work fine.

Excelent, I was a bit stumped on this one.