I've moved the site to another server, Ive copied a completely fresh set of files.
However still getting the same error, also noticed some other functions like Adding a Service to a client errors with 500 Internal Server Error
I have checked the error log, and can see every time it fails to load SolusVM or Add a service :
"File does not exists : /home/****/public_html/post.php, referer http://www.****.co.uk/post.php?post=1"
My Blesta install is in /home/****/public_html/billing
Everything else work's fine just seems to be a couple of random/important features, all error with the above error left in web server error_log
Thanks,
Ashley