Linux Server Config Error

I have a Gandi server with several websites on - among them a wordpress site and a magento store. It is set to Gandi's expert mode (SSH connection) only. A few days ago I attempted an install of the ispCP Omega GUI to ease future additional domain, database setups etc Unfortunately somewhere along the way the install has failed, and I now have a 403 error on my sites. SSH access is fine. FTP access is fine, following a vsftpd reinstall. I tried an Apache2 reinstall hoping that would fix the problem - it didn't. I need a quick fix on this please - sub 24 hours.