I am getting a error message when I edit a dimension byadding to the existing dimension. Example, I have a sheetmetal partwith a square cutout. I edit the sketch and I want to change the24" dimension to add 12" to it. I double click the dimension andthe dimensions looks like this.

24.000in

I add 12" to it like this. 24.000in+12
and I get a message that says "please enter a number between 0 and39370.079"

It does not matter where in solidworks I try and do this I get thismessage. It was working fine until a few weeks ago then it wentsouth for a week or so. Then started working fine. Now it is doingit again.

I am running 2008 SP 2.1 on a 64 bit machine.

Any ideas.

Thanks,
MontySolidworksParts And Features