USB booting :: usb troubles

it works quite well.
but I'm switching back to dsl 1.4
in fact, 1.5 does not let me swap thebgimage and al permissions seem to be changed. i cannot write to dsa1, nor to hda1 no t even to home/dsl (to modify menu, i.e.) that sound weird to me, I must have done something wrong. but I was confortable with 1.4. so, untill i understand it better I will keep 1.5 emebedded zip stored somewhere.
thanks a lot for your help folks