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This problem is addressed in ArcGIS 8.1 Service Pack 1. See the Related Information section to download this pack.
The Create TIN, Add to TIN, or Convert to 3D dialogs will crash if an invalid layer; for example, one with a broken link to the data is present in the document.
This is a known issue.
Make sure no broken layers are present in the document before opening one of these dialogs.