Re: mcc usb & i2c issues
This is a thread more than a month old, and have not been followed up.
OP may have solved the problem, or given up.
I have not used 18F25K50 and USB, but:
In MCC, configuration of interrupts and interrupt priorities are left to the developer:
What selections have been done in MCC for the program?
I suggest to enable 2 level priority in PIC18, then:
USB High priority interrupt,
I2C Low priority interrupt.