Error when WP-Content directory renamed.

Hi there,

I’ve been using BulkPress on our old site and it has been fantastic. Recently I’ve moved the site to a new hosting service. In the new installation all other plugins and the same theme version are running beautifully. There is nothing different in the configuration other than the wp-content directory is renamed in the wp-config.php.

I get the following error:
Warning: is_readable() [function.is-readable]: open_basedir restriction in effect. File(/<ROOT>/public_html/wpmu-content/plugins/bulkpress/bulkpress.php/bulkpress-en_US.mo) is not within the allowed path(s): (/<ROOT>:/usr/lib/php:/usr/php4/lib/php:/usr/local/lib/php:/usr/local/php4/lib/php:/tmp) in /home/yogwande/public_html/wp-includes/l10n.php on line 339

Where <ROOT> is the path the site home directory. This line concerns me:
File(/<ROOT>/public_html/wpmu-content/plugins/bulkpress/bulkpress.php/bulkpress-en_US.mo

It’s not pointing to the language directory as you can see.

BulkPress still allows me to update all of my post types which is great. It’s just the error appears network wide (using WPMU/S) not just on the site it is activated on. The current new site is under development but I would still like to use BulkPress when it is live.

I’m not looking for a fix or even troubleshoot. I’m just trying to get an indication of what you think it might be and what files I would need to look in to troubleshoot it myself. Have PHP coding experience and heavy utilisation of WordPress for the last two years.