SharePoint 2007: “Could not load file or assembly 'NewWebPart' or one of its dependencies. Access is denied.”

I ran into this error yesterday, while trying to create a test web part for a client. I tried various fixes, including (but not limited to): Placing my DLL into the GAC; Checking what else my assembly might be referencing; Changing the security rights on the “Temporary ASP.NET Files” folder; Viewing the assembly bindings using…

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