## Symptom

Program crashes while manipulating a surface (typically when spinning a surface or tilting a surface) with a floating point error.

## Platform

Windows 95, 98, NT

## Suggested Fix

There appears to be a bug in the drivers of some old graphics accelartor boards that can under some circumstances causes floating point errors. We are currently trying to define the extent of this problem though we have seen it only on a small minority of early Pentium II machines. At this stage we cannot suggest a fix and you should use another machine or replace the graphics card with another card from a machine that does not cause this crash (the crash is repeatable so it should be possible to identify if the other machine is OK).