I'm running windows 8. Possibly the problem is with other copies of Newtonsoft JSON that I've got kicking around (definitely used it myself) but that'd be a little odd.
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No dice, same symptoms unfortunately, although the JSON logged errors are gone - https://pastebin.com/FP8ZYkzM
Starting to think it really is just my ancient graphics card not supporting something or other, oh well. Although I haven't had issues in the past.
How unfortunate! But I suppose one bug squashed is still a result, so thanks for that!
d3d11: failed to create buffer (target 0x2 mode 0 size 0) [0x80070057] <--- this line is rather suspect. I can see you are using integrated graphics. Your hardware does support up to DirectX11.1, so it may be a constraint in the HPSX Render Pipeline.
Only thing I can think of to suggest is try getting the latest graphics drivers, the log shows you are on driver version 10.18.10.4425, latest looks like 15.33.53.5161 (found here: https://www.intel.com/content/www/us/en/download/18606/29969/intel-graphics-driv...) so that *might* help out.