atmega644p bootloader

i have a strange problem with a board based on the atmega644p .. I am able to burn the sanguino bootloader using the arduino as the ISP. Also i am able to upload sketches directly without the bootloader again using the Arduino ISP . But if it try to upload sketches after uploading the bootloader using a FTDI board it gives me a error...

I tried both the arduino 0.23 and the arduino1.0.1 and both the bootloaders.


Any clue what stupid mistake am i making?