Session problems: "Warning: write failed: Disk quota exceeded"

Hi, Recently, my php app has started to throw these warnings: Warning: write failed: Disk quota exceeded (122) in Unknown on line 0 Warning: Failed to write session data (files). Please verify that the current setting of session.save_path is correct (/tmp) in Unknown on line 0 I narrowed it down to this code: <?php session_start(); session_register('anything'); ?> (A test file containing only that will throw those two warnings.) The php version is 4.2.2. This script is running in a shared hosting environment. My guess is that the ISP has misconfigured php, and has not set the appropriate permissions to the /tmp directory. Does this make sense? Or is there something that I've missed? Thank you, Beau