It's likely that this issue is network-related.  

To start, please verify the following:

  • Are you on a corporate network that has a firewall or requires a proxy? 
  • Even if you tried with multiple public projects, to rule out the possibility of multiple projects misbehaving please verify if works for you.
  • Finally, are you able to create a new project from scratch and publish it from Haiku Animator?  Verifying this would help rule out of there's some other issue with installation or your workstation.
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