I've noticed this on several occasions now, including the latest update: the JAWS update tool starts installing the update but never finishes - I have to reboot the machine and re-install.
In the latest case (this morning), the last message displayed indicated taht it was installing JAWSPatch. Have others seen this or am I alone? In the end, I did manage to install the latest version and it's now, apparently, working on this machine. For answers to frequently asked questions about this list visit: http://www.jaws-users.com/help/