Sleepwalker on Mega STe

[Official Ninja]

Hi PP!
The adaption of Sleepwalker will not run on my Mega STe.
https://atari.8bitchip.info/SCRSH/sleepw.html

The system needs to be set to 50hz.
After pressing space at the cover-art scan, the screen blacks, then some disk activity.
After this, nothing.

System is 4md USA TOS 2.06 Mega STE with Lotharek UltraSatan using HDDriver 12.79

I also have a 4mb 1040STE USA TOS 1.62 using the same storage solution and the adaption works there.

Thank you.