Hi, it would seem that running latest scummvm from WB with a screenmode of High Res Laced results in the errors. If I set the screenmode to High Res, then scummvm loads and run maniac mansion very well.
This is using CWB ADV v24 with all hacks turned off (FBlit etc). I have NO monitor drivers in Devs. scummvm tooltype is set to PAL.