You can always upgrade Joomla! from 1.6.2 to 1.6.3 using my free
Admin Tools Core
. It only takes 7 seconds to go from 1.6.2 to 1.6.3 (Sorry for the self-plug). So far I have not bumped into any loss of functionality with 1.6.3, but I'm only using it for testing my own extensions and haven't spent more than an hour on it today.
Self-plug not a problem, it's a solid solution to this problem. Your "Admin Tools" are very well respected. There you go, RT Top Tip, use Akeeba Admin Tools to update Joomla