Might just be your drivers not supporting mipmaps with OpenGL. According to this page, your drivers need to support 3.0 or higher, or support an appropriate extension. Most systems support 3.0/3.3 and later, and in fact, the base version expected for modern OpenGL has been 3.3 for a while (On desktop machines). From the look of it, you're using Windows, so does the ANGLE target work? For a lot of Windows systems, DirectX driver support tends to be better than OpenGL. Though, basically any video card made in the last ~8 years should support 3.0/3.3. Intel's been notoriously bad about OpenGL driver support, though.
Any idea what hardware you're running? Driver version? Anything would help.
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