Of course on the same day we release a launcher update that uses Java 7 NIST releases a notice that there is a vulnerability in Java 7 http://web.nvd.nist.gov/view/vuln/de...=CVE-2012-4681.
For those of you that installed Java 7 to use the new launcher we recommend uninstalling Java 7 due to these vulnerabilities. You should not need to reinstall Java 6 as it should stay installed when you uninstall Java 7. If you do need to install Java 6 you can download the latest version here: http://www.java.com/en/download/manual_v6.jsp