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You also need a cap from Vusb to ground on the PIC. I think the data sheet only mentions this in a footnote! I have one of Microchip's demo boards with an 18f2550 where THEY forgot this little detail and the board wouldn't communicate without it.
I think 0.47 μF is the usual choice but the value isn't critical.
I read your post regrading the USB interface with PIC ...I hope your completed that project
Can you help for doing USB interface with pic18f4550..
can share the sample project and code