Tried shrinking it down to 1600x900 but it never got past rendering the first layer. Also tried another smaller PSD file and running the app as administrator but got the same result every time.
Although your demo still rendered with no issues.
If you don’t mind some extra steps, could you check for errors with this thingy. Doesn’t need installing, just download, launch dbgview64.exe, and then run the mouse app normally. Copy the messages if there’s any.
Alternatively, send that breaking file to REDACTED
Thank you once again for the troubleshooting, here's my finished project: https://heian.itch.io/dress-up-legault