I have noticed an issue in Plone (probably more the Diazo theming side).
Since Diazo has become integral to Plone I put this under "Core Development".
When you are using a fresh Diazo theme, go into folder_contents and then navigate to some sub folder, try to click any option on the edit-bar and you will be taken to the original folder than you clicked "Contents" on.
Somehow when using Barceloneta Theme you do not experience this issue issue and I can't figure out how they fixed it.
This issue causes a fair amount of confusion to end users as sometimes they use folder_contents to navigate to a hidden from navigation folder, click add new and add a type, then the type does not appear in the folder they are looking at, it appears in the original folder they clicked "Contents" on.
If it is a bug then fair enough, but if there's a way of fixing it I would muchly appreciate hearing about it.
Also props to the Barceloneta Theme devs, you guys seriously know your stuff.