

I'm thinking, disabling the overlay for steam entirely then re-enabling it may have fixed it, but I'm fairly sure I did this already.
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I then tested steam in administrator and the overlay worked, however then exiting steam and running without administrator also works now. The second step (disabling overlay in global settings then enabling per game) is not possible, as steam now greys out the option per game when it's disabled, so I re-enabled then skipped testing the game. Steam and stardew are already allowed through firewall, so I skipped this. I didn't test the game without changing anything first. Click to expand.So, I've followed this guide and it has resolved this issue, however I'm not 100% sure which step fixed it, or perhaps it resolved itself somehow (this is what I get for testing after just waking up.).
