 I had that same problem on my A0K A000 Rev 0B board. Which I did the same as you. Do no more a replica boards there is always something. Use now the A000 Rev 0A with the Indivision ECS V0 and have no problems more. Use the old A000 tank mouse. See it on my A0000 strange mouse behavior with the AGA MK0CR. The black AMIGA Technologies Hi Resolution mouse work but the white AMIGA Technologies Hi Resolution mouse not. The white AMIGA Technologies Hi Resolution mouse work well with the AGA MK0. The Indivision ECS V0 and the AGA MK0 are great flicker fixers. And are easy to understand how everything works. And the best are the updates for it. Had a lot of problems with the ECS V0 and to much with the AGA MK0CR. Use the BenQ BL000A monitors and know it is picky with resolutions. The best is PAL High Res Laced and have a stable HighGFX Super High Res Laced with AGA MK0. And with ECS V0 it don't work HighGFX Super High Res Laced. A