Failed to load mods: __base__/graphics/technology/Advanced-material-processing-2.png not found
This filepath should be in all lowercase. Filepaths are case-insensitive on Windows, which is probably why this error went unnoticed.

This is referenced in line 121 of prototypes/technology.lua: the icon for the "hephaestus-advanced-purchasing" technology.

That's interesting... I've been running the game a bunch looking for other crashes and that has never come up, running windows 10.
They're all temp graphics anyway so i'm changing it to a (lowercase) one that works in the next update.
I'm just testing if it's stable, i think i can put it out tonight.

Thank you for letting me know!

Alight, i sent out an update that replaced that with a different default graphic, and everything is lower case now, hopefully that fixes your problem until i get around to make custom icons for the research tree... that's kinda back burner priority right now.