There is a known issue with a control used in parts of PhotoModeler 6 (3D Viewer Options Dialog, Preferences Dialog, Project Status Report) that becomes unstable when PhotoModeler 5 is uninstalled after installing PhotoModeler 6.
There error message mentions: "CoCreateInstance Error Code -2147418133"
Did you uninstall v5 after installing v6? There are a couple fixes for the issue:
Download and extract “registerControl.zip” from http://www.photomodeler.com/downloads/registerControl.zip to your PhotoModeler 6 install directory (c:\Program Files\PhotoModeler6). Then double click “regTree.bat” to execute a small utility to re-register the control. When you restart PhotoModeler 6 the problem should be resolved.
Re-install PhotoModeler 6 from CD, then apply the most recent upgrade patch which can be downloaded from here: http://www.photomodeler.com/support/upgradepatches/default.htm