Default Folder is known to cause Strata Design 3D CX to crash. If Strata Design 3D CX is crashing and you are using Default Folder, you should turn off Default Folder and see if the crash goes away.
From St. Clair Software's FAQ concerning this issue:
"Default Folder X has been carefully designed and tested, but there is still a possibility that it may cause undesirable behavior or instability in an application. Fortunately, the robust design of Mac OS X isolates those effects to the application that is affected - Default Folder X cannot crash Mac OS X itself.
If you do encounter problems, please let us know at email@example.com. We try our best to make sure that our products work seamlessly with the applications you need."
When moving suspended renderings that contain linked textures, be sure that the .RDF and linked texture files are all located in a common folder. Suspended renderings will not prompt for missing files, so make sure that all the needed files are placed with the .rdf file.
Illustrator CS3/CS4: When using Illustrator CS3 or CS4 to create 2D objects for use in Strata 3D, you need to select either the Media or Web template.
Change in tabbing and clicking between text fields in the Project Window. When selected, an editable text field must have its value, changed or unchanged, committed using the tab or return/enter key. Once that field's value has been committed, then the other text fields will become available for selection. Tabbing between fields is no longer available, you must mouse click to select the fields.
If you would like to reset all of your Strata 3D CX preferences, choose the application's Preferences command from the Strata 3D CX menu. Sometimes (though it is rare) the preference file may become corrupt and cause the application to function strangely. Resetting the preferences can sometimes help to resolve abnormal behavior in the application. To Reset the preferences, go to the Preferences dialog and click on the Reset button. Use the Quit option to immediately reset the preferences.
Strata 3D CX utilizes the 3D graphics card in your computer for drawing the modeling windows. This can include, but is not limited to the movement of objects and displaying textures in the various windows. It is also used for other functions in the program. It is usually a good idea to keep your drivers up-to-date. Apple supplies both the nVidia and ATI drivers as part of the system install. Occasionally, however, a driver update may become available on the Apple website for both the nVidia and ATI cards, or via Software Update. ATI may also post newer drivers on their website for cards purchased separately from your Macintosh.