I had the same problem and I solved it. If you still have this problem you should check the option you used in Fluent to export data as the others already wrote.
As you said you can plot the velocity-contour in CFD-Post because if you export "Velocity" you can't plot any vector because "Velocity" is scalar. I think it is the velocity magnitude without any direction. You need to export "Axial Velocity" and "Radial Velocity". If one of them is missing, you will have issues in CFD-Post plotting a vector or a path line.
I am not sure but I think you don't even need the velocity magnitude to plot vectors. The axial and radial component should be enough.
On my case, I have a 2D axisymmetric simulation.
Best regards, Mustafa
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