After my installation of Ver 1.1.8, I attempted to run a “Check for Update” through Magento Connect, so that I can upgrade the installation to 1.2.1 (the newest version right now).  The page did a postback and return nothing (a blank page - no listing of any updates).  Did a quick Google online and came up with the fix in the Magento forum:  Copy the following extension:

magento-core/Mage_All_Latest

Make sure no trailing spaces, and you should be able to successfully download and upgrade to 1.2.1.  From the forum it appears to be an issue with ver 1.1.8, as I didn’t have problem with version 1.1.6.

blog posting, magento, technical notes check for updates, magento, Magento Connect