I am using the latest nightly build installed on our linux machine. If I select a PDB and move it around, the selection leaves a "shadow" behind (see attached snapshot). Thanks Jean-Fran�ois M�n�tret, PhD Boston University School of Medicine Physiology and Biophysics Department 700 Albany Street W315 Boston, MA 02118 Email: menetret@bu.edu Mailing address: 715 Albany Street