I don't think there is a link with USB (although it works with a breakpoint in the usb host change function from host storage example) because I have the same difficulty in a project without USB. I copy your code in my blank project configured for my RAM and LCD config with only GUIX_thread, button_thread to manage IRQ11 interrupt for needle command and basic HAL thread. The code compiles and has the same memory allocation issue. I checked thread priorities, they were all at 8, I put JPEG (disabled) at 8, DAVE at 7, r_glcd and GLCDC at 6. If i call tx_byte_allocate or malloc manually in guix_thread_entry it returns SUCCESS so the issue seems to come from calling malloc in the circular_gauge_set_angle function.
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