Ext Designer 1.2.3 build: 51
Reverted the fix related to layout config object as it was creating more havoc than it was fixing.
Expect the autoupdate to work soon but for those with proxy issues or that can't wait you can install the latest version by downloading the following file into the following place depending on OS
Win XP C:\Documents and Settings\<username>\Local Settings\Application Data\Sencha, Inc\Sencha Designer 1.2\
Win Vista/7 C:\Users\<username>\AppData\Local\Sencha, Inc\Sencha Designer 1.2\
Linux ~/.local/share/data/Sencha, Inc./Sencha Designer 1.2/
Mac OS X ~/Library/Application Support/Sencha, Inc./Sencha Designer 1.2/