Megadrum interface code size

[kooroshi60]

Megadrum USBMIDI connects and disconnects all the time when I burn the compiled source code into Pic18f2550 using Mplab C18 compiler. But it works fine with the Firmware V2.

The generated Hex file by C18 is 1703kb bigger than pic18f2550-12MHz V2 firmware.
The board I have made has a 12 MHz resonator. I added these files to C18 in order to generate the Hex file.
Main.c
Usb.c
Usb_descreptors.c
Usb_device.c
Usb_function_audio.c

This is the only error I see during compiling: (But the build is successful)
D:\ SOURCE CODE MEGADRUM\ main.c:197:Warning [2058] call of function without prototype

Can anyone tell me what can be the problem? Can the Hex size have effect on the function of Megadrum interface?

Thank you in advance.

[kooroshi60]

Does the code size matter at all? Or I have to use another compiler in order to get smaller hex?!

[dmitri]

I recommend you to ask about MPLAB and C18 problems in http://www.microchip.com/forums/

[kooroshi60]

Trovato!

The problem was the windows driver. Every thing is working fine now.
Thank you Dmitri. You are a genius. I love the MegaDrum. Works perfectly with Roland gears.

Cheers.