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From the release announcement:
We just released minor optimization patch – Vivvo 4.1.6 (build 4214).
This patch introduces few nice optimization improvements, including faster template rendering and addressed couple of minor bugs. Also, this patch is important to anyone using PHP 5.3 on server, for it solves compatibility issues with latest PHP release.
The patch can be downloaded from the Client area, be sure to make a backup of your site/database when you update, and also be sure to correctly replace your files on your server. View changelog for detailed information on this patch.
More info: Vivvo Website.