Actually, I don't think that is the problem. The interrupts should be enabled in the USB code (unless the poster has altered this to use polling, instead of interrupts).
There are several other pot ...
I have problems to put my timer0 to count 1s, if I'm right this confiuration set my PIC to oscilate at 48MHz with a xtal of 20MHz. Then the cicle is
: (1/48000000)*4 ~= 8 uS to timer0 add by 1. But t ...