We keep adding new web-to-print features to our system. Some of them are not backward compatible and require template re-processing. We decided against automatic re-processing of all templates because of the risk something goes wrong with the template and no one notices until an order is printed.
We added a feature to re-process templates manually if they are out of date.
At the moment almost all templates are out of date. You can re-process them manually from template overview page.
Do not re-process templates unless you need to. Leaving them as-is won’t affect anything.