Yes, it did it for me too when entering values directly into the hardware and software fields.
This form I sent though was without the data connections.
Previewing on the server, my list populates the hardware, software, etc boxes and when an item is selected its value appears in the hardware and software boxes but the total cost. It never populated with anything.
It looks like the values aren't being passed to the total when they are not directly input (or in my case a result of a previous calculation).
Thank you again.