A bug was introduced by Java version 1.6.0_51-b11-456-xM4508 on Mac OS X which has caused Java applications to be displayed incorrectly.
You can check your Java version by running the following command at the terminal:
/usr/libexec/java_home -v 1.6 -exec java -version
Here is an example how the Point-to-Point GUI is affected:
To solve this issue, Apple has released an updated version of Java. Here are the links to manually download and install these updates: