Digging deeper, and both Spatterlight and Gargoyle use the same engine, so that could be the problem. Could i get the version of Spatterlight you're using? I'll try to see if it can be fixed.
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Thanks. I tried Lectrote and indeed runs smoothly, although I prefer Spatterlight because it has more options regarding game appearance.
Amiga version runs perfect as well (I like the included interpreter, as it gives black background, which is my preference of play). Besides it's an added bonus to save your game in hard disk (where other new adventure games aren't capable of; thus you have to play from floppy disks all the time).