Have you worked through any of the bundled tutorials?It is a slightly quirky piece of software and the CAD side of things is not the greatest but it does a good job of creating toolpaths.The 3d view is only for simulation and if you have it set for the very highest resolution,it is very slow.Have you found a working post processor for your machine and does the Gcode from it look viable?How does it compare with the software you previously used in other respects?