I've emailed you. It only happens ony the 128k toastrack. I've ran the game on a Harlequin 128k and no worries. Simply put, once I get to screen 4 at the ledge where the shoes power are obtained, and jump left, the ape jumps but jerks from left to right so loses control. It onky affects left jump. Runs left OK. runs and jumps right OK, but then this is continued from then on. Restarting after losing the lives makes the glitch go away then once I'm at that spot it does the same thing. Pleasr note this only happens using O as left. using 6 or J there is no problem. Also I use the toastrack on any other game with O as left so no worries with the key itself.
David