This version includes some issue resolutions for Magento version 1.2.x. A full list of items included in this release can be found on the release notes page.

Diff files for the latest version can be found here.

Please use this forum to discuss any issue with Magento 1.2.1 and please report all bugs on the bug-tracker.

Note: We do NOT recommend upgrading a production installation of Magento directly. Please backup database and all files before upgrading. Please make sure to check file permission before trying to upgrade through your Magento Connect Manager.

This version seems to be more stable on the upgrade process, my experience on the upgrade is quite smooth process. And in the magento forum, there is a little less complaint on a faulty upgrade process. For upgrading better turn off the cache before run the upgrade process.

Well in my case, after the upgrade process the screen won’t show up. The store page also down, it only gave me “Internal Server Error” page. By looking at my server error log, shows that the server is complaining about the file permission on some files. It seems that the Magento Connect Manager has accidently change the permission to which is not supported or denied by the server. The file that was changed is “index.php” in your Magento root directory, and “index.php” in the downloader directory. Change them to “644″ or writeable only by user, and it should now able to run without problem. 

Please remember to backup all your files and database before doing the upgrade process, especially when doing it on a production server. If you had encountered another problem regarding the upgrade, just head on Magento Upgrade Forum here.

update: After seeing more into the logfile it seems that many file need have their permission check, especially the file named index.php. 

• Google Website Optimizer integration
• Google Base integration
• Scheduled DB logs cleaning option

For upgrading issue, user are advised to visit the Magento Upgrade Forum. It is advised that the upgrade should not be carried out directly in a production environment. Remember to make backup of your site before doing an upgrade on your Magento site.  

Source : Magento Blog

We also want to note that there is a diff file for the changes between 1.1.5 and 1.1.6 available.

We will also be releasing an updated version of the sample data in the coming days, so stay tuned to the Magento Blog for information on this.

If you have any upgrade issues, please visit the Magento Upgrade forum.

Note: We do not recommend upgrading directly on a production environment. 

Fixed Bugs:

• Fixed Google Checkout table rates issue
• Fixed SQL error when upgrading some existing databases
• Fixed layered navigation index refresh
• Fixed refreshing products count in categories management page
• Fixed wrong order status after invoice is created
• Fixed sending background copies of sales emails
• Fixed online customers grid filter
• Fixed optional DOB field verification that prevented to proceed to the next step of single-page checkout
• Fixed empty France regions names
• Fixed translations and locale settings used in PDF print-outs

This module is considered beta release, please contact me if you had trouble with the module. Or if there is a bug issue that need to be resolved.

The module it self can be downloaded from the magento connect site.

Indonesian Carrier Service Shipping Module

The current documentation for the coding system is a bit sparse. We need to dig more into the code to find out more about something. Fortunately the documentation inside the code is quite rich, and could help a little. But surely a better documentation is needed for this, so that more and more developer attracted to create modules for the system.

Right now I’m trying to convert my OSCommerce module so that it could be used with magento system. The development track is quite slow, and there’s quite a lot of trial and error in the coding process. But I have managed to make the module to work, and could process the shipping cost. But the administration module is not finished yet. Hopefully it could get finished in few days.