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If I reinsert the D.E.B.S. disc and play that in Kodi, I get the list of titles etc., but when I select Show Blu-ray Menu it just gets stuck on Please Wait... forever.

Understood. Please give me a few days to investigate this issue (assuming nobody else manages to solve the problem beforehand), it shouldn't take more than 5 or 6 days, hopefully. And apologies for making you wait.

I updated Kodi, which now has a completely different interface, and it's just an infinite spinning wheel rather than a Please Wait... message.

and it's just an infinite spinning wheel

That's a classic error when a Blu-ray menu is not supported (or at least not with a specific Java version), which is why I'm going to need time to investigate this. Once I have received this particular Blu-ray, maybe I can find a way to make Java work with it by switching Java versions until it works or something.

Just to be clear, the Blu-ray menus *do* work with other Blu-ray discs, yes ? Just to make sure the problem you're having is not due to some obscure Java configuration problem.

Yeah, I've never had any issue with any other disc, and other discs have continued to work fine once I got the environment variable thing sorted out.

Thank you for clarifying. I will probably receive D.E.B.S. on Friday or Saturday at the latest. Hopefully I can figure out what's causing this.