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Hi, we're currently investigating this issue and trying to reproduce with similar hardware. So far with no result though and we also haven't heard of this issue before. I will keep you updated.
unfortunately we currently have no plans for a demo version. But it is on a 50% sale right now! :-)
Pixabyte.tv has posted their video review of Entropy on Youtube! Be sure to watch it, it gives quite a good impression of Entropy's puzzle design, and how the game feels: Youtube.com