for me on windows :

turning on smoothing then turning it off causes the mesh to corrupt and give a 'has to close' error
using the bevel tools for any real length of time causing a 'has to close' error

and so on. the first error I listed was verified by other users is a real show stopper.

and I reported it 3 years ago and it's STILL not fixed.

since then I've washed my hands of Daz products anyway and moved on. there's better software out there.