There is an issue with Respondus LockDown Browser for Mac users running the latest Java update (1.6.0_31). The problem occurs during the startup of the Mac version of LockDown Browser or when submitting a test, which can cause the software to stop working and freeze your computer. Respondus has resolved the issue and does not expect future versions of Java to cause similar issues. To get the fix from Respondus, you must download and install the full version of LockDown Browser (version 1.0.4.37) from the installation page. The update process within LockDown Browser does not contain the latest fix, so use the link above to get the full version.