Yep, some artists here have the same prob. I always use my mouse so... anyway, hope this helps.
The latest Hot Fix (2009.09.22) from Autodesk for Autodesk® 3ds Max® 2010 and Autodesk® 3ds Max® Design 2010 software includes fixes for issues with stability and performance. Specific areas addressed are Camera Maps, DirectX® Shader Material, double-byte file paths, InfoCenter, Material Editor, MAXScript, mental ray®, Non-Uniform Scale, ProCutter, Render Window, Vertex Color, and Viewport Performance.
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But if you find it's still happening after the hotfix, you should enter it here, and it would be helpful to post it here as well.