I'm using the latest version of Tecplot 360 to visualize data computed using OpenFOAM (and using foamToTecplot360 to convert the data to *.plt files). I can load the grid and data file and view my data just fine. However, I'd like to extract the circulation. Following the advice in a different thread on computing circulation, I am setting a contour value (using line contours) then doing Data>Extract>Contour. After selecting how I would like the zones created, I click OK and get a message that the contour zones were successfully created. No new zones show up though. This happens regardless of which zone creation option I choose (each contour level as a zone, or each line segment). Is this a bug or am I doing something wrong? Thanks in advance for any help.