When antialiasdisplay is set to true, there is an issue with rotating around bonds.
Normally clicking either side of a bond should rotate only the group attached to the same side of the bond. This works well with antialiasdisplay set to false.
If not, clicking on one side of bond could either rotate the group attached to the same side, the group attached to the other side (allways the same group) or the whole molecule.
This bug has been found with v 13.1.10, and can be reproduced from the applet on the chemagic website : http://chemistry.illinoisstate.edu/osrothen/web_molecules/script_page_large.aspx