You can run the SQL via PHPMyAdmin (there should be a copy on your server) or you can edit the db_cache table directly and change the field type from 'blob' to 'mediumblob'.
Alternatively, to test if the 'blob' field is the cause of your problem, you can change to file-based sessions by finding this line in both your includes/configure.php and admin/includes/configure.php:
PHP Code:
define('STORE_SESSIONS', 'db'); // use 'db' for best support, or '' for file-based storage
and change it to:
PHP Code:
define('STORE_SESSIONS', ''); // use 'db' for best support, or '' for file-based storage
Also check that you have the right path in admin->configuration->sessions->sessions directory:
eg (your server may differ):
home/your_server_account/public_html/cache
(no trailing slash)
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