Could only imagine the J102 jumper being a problem when the Agnus is no ECS afterall... Better check that all Chipram is functional.
You can also set up an OCS Agnus with 1 MB chip, but it'll crash the machine when the first 512 KB run out. (The missing bit in Agnus' address registers will make the address wrap around to the lower 512 KB and trash some other data there.)
