Not wanting to hijack the thread,
But
I do have a simple calibration piece, consisting of only straight lines (no curves) and it's solid, not hollow, that CURA doesn't seem to be able to slice....
I drew it in Sketchup, and exported as STL.
When loading into CURA (14.12.x) the 'normal view' looks correct, but the layers are wrong - and printing the g-code resukts in the piece like the 'layers'.
I changed the darwing several times - and no success... :(
Sorry, no picture I can attach on this computer.