URL to your eFiction: http://beautifulmemoirs.net/efiction
Your version of eFiction: 3.5.1
Version of PHP: 5.2.9
Version of MySQL: 4.0.21
test account: yes login: Bella pass: 123456
I just tried to log into the site I maintain and I received these errors. Along with one that states that says "You are not authorized to access that function." When I try and log in.
Warning: session_start() [function.session-start]: open(/home/interworx/var/session/sess_0cc53a50ab02cbe19a6c71960edbe53b, O_RDWR) failed: Permission denied (13) in /chroot/home/beautifu/beautifulmemoirs.net/html/efiction/header.php on line 56
Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at /chroot/home/beautifu/beautifulmemoirs.net/html/efiction/header.php:56) in /chroot/home/beautifu/beautifulmemoirs.net/html/efiction/header.php on line 56
Warning: Cannot modify header information - headers already sent by (output started at /chroot/home/beautifu/beautifulmemoirs.net/html/efiction/header.php:56) in /chroot/home/beautifu/beautifulmemoirs.net/html/efiction/header.php on line 65
Warning: Cannot modify header information - headers already sent by (output started at /chroot/home/beautifu/beautifulmemoirs.net/html/efiction/header.php:56) in /chroot/home/beautifu/beautifulmemoirs.net/html/efiction/header.php on line 66
Warning: Cannot modify header information - headers already sent by (output started at /chroot/home/beautifu/beautifulmemoirs.net/html/efiction/header.php:56) in /chroot/home/beautifu/beautifulmemoirs.net/html/efiction/header.php on line 67
As long as you haven't done any modifications, typically session problems are something you should talk to your host about. You might also try searching the warning message using the search feature here since I think I've seen someone else with a similar problem. Just make sure you leave out all the parts that are unique to your site, such as the part of the file path with your account in there. (In other words, leave out this part: /chroot/home/beautifu/beautifulmemoirs.net/html/efiction/ because it's unique and will screw up your search, as no one else will have posted it)
That said, I logged in to your test account and I'm not having any issues whatsoever.
Definitely contact your host. The error is saying it can't open/start a session file. This is usually either a problem with the server running out of disk space or a permission problem.