chainloader problem

[Vega]

Hi to all,   

I'm marco and I'm new to grub-devel maling list. Forgive me for my bad
English. I have a strange issue with chainloader both with 1.96 and last
csv version.
I've compiled grub2 and I installed it on a usb stick with

dd if=boot.img of=/dev/sdc 
dd if=mycore.img of=/dev/sdc seek=1

It boot and I got grub shell's prompt. From here I'm able to boot linux on
my primary harddisk that biosdisk driver see as (hd1). The usbstick is
(hd0).
But if I try to boot my first hard disk or windows with
chainloader (hd1)+1
boot

or for windows
chainloader (hd1,1)+1
boot

the screen became black and it hang...

but If I try to load the same grub2 image with grub-0.96 it work! i.e.: I
start with grub-0.96 cd... Now primary disk is (hd0) and usbpen is (hd1)
from grub-0.96 shell I run
kernel (hd1)1+125   <-this because my grub-1.96 core image is 125 blocks
boot

I got grub-1.96 shell... then 
chainloader (hd0)+1
boot
and my first disk start....

Have you some idea about this strange issues ?
 

Thanks in advance and forgive me again for my bat english