I had this installed and working. I changed the config.php to use a different image rather than banner.png. When I did that, I just got blank pages so I reverted back to the old config.php (I had saved it). However, now I get a db error. Please see link
I don't understand what is causing this error. Just to be certain I hadn't gone mad when I thought I saved the old config.php, I started again with config.php.template, changed just my database details but still get the same error.
Never mind about this error - turns out my web hosting company was doing upgrade/maintainance and moved things around just at this moment. I have had to change 'localhost' in the config file to 'mysql.interdns.co.uk' to make it work but it does again.