Hi I have seen the odd post here with the same problem but no solution.
I have created a very simple 360 slide in Captivate 2019 as a responsive project NOT a VR project. I check it in captivate and it works fine. I publish it and the preview after publishing works perfectly. However, when I run the index file all I see is a black background in any browser I try.
On which devices? Since you talk about 'responsive projects', you have tried on devices, correct? Were they capable of showing VR content?
Thanks for th link- this makes sense now that there is security in browsers to stop them accessing local files fully. I am actually practicing with captivate to either host in out VLE (Canvas) or if I can get that to work I can host on my institutions local server. I will get them to host it and test it there.
good luck with that. Hosting a Captivate HTML5 output like your VR project on VLE Canvas or on a local server will work as long as they are web or cloud based and running on http or https protocols. And they need to recognize (MIME or Media typewise) the JSON format which is essential for Captivate's HTML5 output.
I do not think this works in IE, but it should work in Edge