Finally discovered a problem in a .mapleinit file for a scientific program that I had installed. it ended with the offensive line: plotsetup(x11): Deleting that line solved the problem. Thanks for all advice, Roger

Thanks Acer, I have both J2SE 1.4.2 and J2SE 5.0. I have tried all combinations of Java Applet and Java Appllication Runtime settings, all with the same result. As you suggest I will email support@maplesoft.com. Roger

I have just found that if I execute the entire Document using the !!! button, following the 2x-9 -> Document Block an additional Document Block appears containing: Error, invalid input: smartplot uses a 1st argument, f (of type {algebraic, ({set, list})({algebraic, algebraic = algebraic}), algebraic = algebraic}), which is missing Can anyone tell me why this error is occurring? If I execute the Document one Document Block at a time, the Error message block doesn't occur! Roger