Converting from PIC18F452 to PIC18F4550

[PJALM]

I am trying to convert an exsisting project from the PIC18F452 to the new PIC18F4550 but cannot get anything to work. It will compile fine but when I load the new firmware onto the new PIC i get nothing at all. I tried simply just sending fixed characters to the LCD and even that dosn't work.

I am using the Microchip USB Bootloader, I don't know if this may be part of the problem or not.

Has anyone experienced simular problem converting to the new USB PICs?

I am including a scematic of the circuit I am using, I am hoping its just that the ports are not configured correctly for the new PIC.

Thanks for any help.