Hi @sknarberg, thanks for the access. This is caused by PHP attempting to read the backlight/data/sessions folder to try and delete old sessions. I’ve tried to change the permissions so that it can read that directory, but nothing I’ve tried works.
I’ve instead added your host to a list of exceptions so that sessions will instead be saved in the standard directory. The error’s not showing up any more. I’ve changed this both on your server and in our code for the next update. This should continue to work properly and there’s nothing else you should need to do.
For some background: many hosts had broken configurations for session handling and it was quite a headache for several users and for support. We changed Backlight to saves session within backlight/data/sessions to avoid this issue. Since using the standard configuration is working for you, this change away from backlight/data/sessions shouldn’t cause you any issues.