if i do:

Assemble("JS 0x463BC7", 0x483B46, &am, 0, 0, errtext);

this returns me 0x78 0x7F

But!!!

0x463BC7 - 0x483B46 = 0x81 = 129 > 127!!

This doesnt happen in the Olly 1.10, only the engine on your site when i use it in my app...

Any ideas whats going wrong?

Many Thanks.