Hi Christopher, I've changed Chimera code so that restoring a session with volume data will use the original model numbers from when the session was saved. This should fix the problem where using the "reset" command to return to a saved view point does not work correctly. The restored model numbers will be correct even with session files written with previous Chimera versions. Here is the new code: https://www.cgl.ucsf.edu/cgi-bin/chimera-get.py?file=prerelease/volumeviewer... This zip file contains a folder VolumeViewer that replaces the one in your current Chimera 1.2348 - 1.2352 in directory chimera/share or on the Mac in Chimera.app/Contents/Resources/share On the Mac you need to ctrl-click the Chimera icon and select "Show Package Contents" to see the folders hidden inside Chimera.app. The new code won't work with Chimera versions older than 1.2348. Tom