That's just a lie. Most probably they only have that font issue and nothing else. Recently I thought I have found something that could have been a feature that applies only to 1.02, but it turned out I was wrong. So if somebody says "ZOMG, MA SCRIPT WORX ONLY WID LEGAL RMXP!", he's lying.
With incompatibility I meant the sort of coding. Have you ever experienced that you use two different scripts in your game and they interfere with each other? That's what I meant.