I don't know whether to classify this as a bug or a
limitation of 2008, but whenever you have a model that's fully
parametric where every dimension is controlled by an equation in
the design table, you get an error any time you "touch" the
dimension in the sketch.

Examples:

With Equations - http://files.engineering.com/g...with_equations.SLDPRT

Without Equations -

http://files.engineering.com/g...hout_equations.SLDPRT

It never happened in 2007 or earlier versions and is quite annoying in 2008.

Examples:

With Equations - http://files.engineering.com/g...with_equations.SLDPRT

Without Equations -

http://files.engineering.com/g...hout_equations.SLDPRT

It never happened in 2007 or earlier versions and is quite annoying in 2008.