However, there is no 32bit version of Oracle's Java for the Mac. The only way to get any sketch running is by reverting the JRE order to the previous state (Apple's 64bit, Apple's 32bit, Oracle's 64bit 7u6).

I wonder if this is known or even documented behavior, but I couldn't find it anywhere.

1. void setup() {
2.   size(100, 100);
3.   color col1 = color(0, 0);
4.   color col2 = color(1, 0);
5.   fill(col1);
6.   rect(10, 10, 20, 80); // black rectangle
7.   fill(col2);
8.   rect(40, 10, 20, 80); // transparent rectangle
9.   fill(0, 0);
10.   rect(70, 10, 20, 80); // transparent rectangle
11. }

The first rectangle is drawn fully opaque although the alpha channel is 0. This does not depend on the rendering method (standard, P2D, OPENGL). All rectangles are drawn as I would expect if the alpha channel is 1 (or any other value) rather than of 0.

If I load the index.html with Safari (6.0), however, only the text that should appear below the applet is shown at the top of the page. There isn't even an outline where the applet should be. The Java console doesn't show anything (and isn't opened in the first place), so it seems safari doesn't even load the applet.

Execution of Java applets is enabled both in the general Java preferences and in Safari itself.

It seems there has been another post addressing this (or a similar) issue more than a year ago but got no answer.