I am using version 0148 and have the following problem with mouse events:

When calling mouseX or mouseY within draw() or any event function such as mousePressed(),
the x and y mouse coordinates are not read to mouseX and mouseY variables when the cursor
is within 15 pixels from the lower right corner. So in a 400x400 screen the maximum values I
get to read are x=384 or y=384 rather than 399. this one is a simple demonstration:

void setup(){
size(400,400);
noFill();
stroke(255);
}

void draw(){
background(0);
ellipse(mouseX, mouseY, 20, 20);
println(mouseX+", "+mouseY);
}

forgot to mention that the operating system is Mac OS 10.4.11

There's nothing we can do about that--it's a restriction of Java on Mac OS
X. Apple doesn't send mouse events because that's the grow box area. You
can file a bug report with Apple at bugreport.apple.com if you want them to
fix it.