upfront ''fixer" theme issue - slider (?)

Fresh wordpress install on vps. installed upfront fixer and parrot.
Preview looks OK from admin console but visitor does not see the main slider (?).
Therefore a mostly white screen appears . Am I forgetting something ? Something with ACL on certain folders ? On the server default directory access is set to 755 and files are set to 644
Name of site is http://www.aga3d.nl by the way.

thanks