Sequences in the Navigation area of the Workbench can be shown with the name "No label". This can occur if your sequence representation is set to something other than the default Name. If so, objects showing "No label" do not have information for the sequence representation that is currently selected.
It is possible to change the sequence representation in two ways. One is via the navigation area of the Workbench by right clicking a sequence or folder and selecting the Sequence Representation | Name option from the drop down menu.

 
 
 
Select Latin name
 

Select Name



 

It is also possible to change this setting through the user preferences dialogue. This is described in the manual as follows and shown on the image below:
User-added image