Im trying to update to joomla! 3 from 2.5 but the update procedure do not work at all. this was the same problem i had when was trying to upgrade from 2.5.16 to 2.5.28) so its not a Joomla! 3 error. Basically it finds the update i press the button to install it and then remains forever in the next screen saying "Updating your Joomla! files. Please wait ..."
To update to 2.5.28 i copied the update with FTP hoping that a damaged file was causing the problem. When i log in with FTP i can see that update package its downloaded in the tmp directory. I am able to install and uninstall extensions.
thank you Mike