BackUpWordPress – directory isn't writable error

BackUpWordPress plugin has been working happily for a month until we made the site live last week when we promoted it to live (in the end we did this by just promoting the wp index.php file, changing the path reference in it and leaving everything else in the existing folder structure)

So the follwoing error message is now displayed:
BackUpWordPress is almost ready. The backups directory can’t be created because your wp-content directory isn’t writable, run chown : D:/abc…org/wwwroot/site/wp-content/blogs.dir/5/files or chmod 777 D:/abc…org/wwwroot/site/wp-content/blogs.dir/5/files or create the folder yourself.

I’ve looked up support issues about this and tried the following –
I’ve updated the directory path in both the DB and then also in WP settings – setting it back to the original still existing backup folder which was directly under wp-content – and both times the plugin is automatically setting it back to wp-content/blogs.dir/5/files. I can’t find any reference to why it’s doing this and am not sure where it is getting this path from. I’ve also checked the access levels and everything seems to be 777.

Any ideas gratefully recieved.

thanks,
Dave
ps. I’ve tried following the php, but i’ve never written any so it’s a bit tricky

http://ww.wp.xz.cn/extend/plugins/backupwordpress/