[peterska2]

The only reason that this would occur is if you have not reverted your postbit template on upgrading to 3.6.0

Due to the number of templates that have changed between 3.5.x and 3.6.0 it is recommended that you revert all templates for your style as this fixes issues such as this one and ensures that all the new 3.6.x features work.

Of course you can manually edit each template to ensure that it works on 3.6.0, but this can be a long winded job and unless you are very familiar with the templates, it is not something that can be done easily and can cause a lot of confusion.

Really, the approach that you take depends on how modified your templates are to start with. If they are minimally modified then you can revert and reapply any modifications a lot easier than doing all the upgrades manually for each one. However, if they are extensivly modified, then it can be as quick, if not quicker, to upgrade the templates by applying all the changes by hand.