Click here to launch with Java Web Start
Tool outputs could overlap with existing objects, and in particular groups of those objects. This made repetitive tool use (for rotation or translation, for example) problematic. Tool output selection is now much more intuitive and clear: outputs are objects that did not visibly exist before the tool was applied.
Setting custom object colors could cause severe performance problems in the presence of large groups of objects.
quaternion projections - with the removal of the hidden symmetry axis, it is no longer possible to project a 4D polytope using a quaternion rotation
arbitrary strut lengths - the new strut length panel does not yet support lengths that are not simple powers of tau
H_4 symmetry - you'll probably have trouble if you try to construct a strut between vertices generated by H_4 symmetry.
Zomod import - does anyone still care?