Glitches on accelerated/fastmem AGA Amiga with legit 030! Please try $1fc,0 at start of Copper lists for OCS release compatibility on AGA. On all chipsets, if VBI updates Custom registers put a suitable wait e.g. $1905,$fffe before moves to sprite or bitplane ptrs to avoid a race condition. Advice for all HW programming on Amiga. :)