There's an issue with changeset 1086 that needs to be noted in UPGRADING, and pointed out here.
This change alters the way that the common categories and locales in the navbar work. These templates - navbar_categories.tt and navbar_locales.tt - are ones which guide admins are almost certain to have modified, since the categories and locales in the distributed templates won't be relevant to most guides.
First of all, your template needs to check for [% config.enable_common_categories %] rather than [% common_categories %] in order to know whether to add this <div> to the navbar or not.
Secondly, you need to replace <a href="[% catloc_link %]Category_[% cat %]"> with <a href="[% config.script_url _ config.script_name %]?id=Category_[% cat %]">
So this is just a heads-up to people to be aware of the changes. I haven't added this to UPGRADING because I'm tired and in the middle of tracking down other upgrading issues. Could someone do that, please?
Kake