I've attached a screenshot of what I see on Joyride once it starts to load the 2nd part. This is on my 600XL PAL with RespeQT 5.3 and 5.4 rc1 under Ubuntu Jammy (edit: Also I just installed 5.4 rc3 from this thread with the same results). I put in the real GTIA and Pokey to be sure it wasn't my faul...