Thanks...but unfortunately it's not that!!
As a standard I always use (ironically enough!!) 15 decimals!
What I'm struggeling with is that for exactly the same set of values, there are 2 different answers being displayed on the different computers (all running Excel 2007, but which was loaded...
I have applied a polynominal trendline to a XY Scatter plot.
The trendline appears to be visually correct.
However, the displayed equation does not match the plotted trendline!
It however appears to be an error on a certain version of Excel 2007, as a few of the users in my office also get...