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Well isn't this how it goes? I found the solution in: https://github.com/helix-toolkit/helix-toolkit/issues/282


As recommended there, I updated Effects.GetBestAdapter() line 135 to:

if ((bestAdapter == null) || (videoMemory > bestVideoMemory) && (systemMemory > bestSystemMemory))


and now the examples run. I guess these fixes have not been merged into the repo yet?