I had the same problem when using Cura on “another brand” of printer with one of my designs. Slic3r and my TAZ 3 printed fine, but the other printer left gaps in the top layer of the same design.
It looked like the last layer was never actually printed (as though there were an off-by-one error in counting remaining lines of code to excite).
I solved it by telling Cura to make the top layer thicker (3x the thickness of one extrusion layer instead of the default 2x). Worked fine…I would expect the same to work with Cura for my TAZ if it has the same problem (I’m on the road at the moment and can’t test until I’m home).