When you create a HapYak project you'll need to ensure that your OVP (Brightcove, Wistia, Kaltura, Vimeo, etc...) is not restricting where you can embed the video.
If there are domain restrictions applied to the OVP account or the video itself you'll create a project but the video window will be black.
The solution? Simply add the following to your list of allowed domains.*.hapyak.com
if for some reason you can not add this "wildcard" domain addwww.hapyak.com