I didn't notice this until I'd filled out my gear (in a copy)... but then I made a fresh copy and checked straight away and it's there from the start.
The 'White DPS' (Gear:C2 and D2) is coming out as 'Err:529', which I'm guessing in turn causes a load of other errors (Gear D:3-7 are '#DIV/0!'), and makes the total DPS (Gear C:8) come out as 0.00. Not very helpful.
The actual contents of Gear:C2 are "=mhdps+ohdps+wfadjdps", which looks correct. If that's referring to DPS B39:41, then know that both B39 and B40 there are also 'Err:529'.
That error seems to be what's described
here. Given it appears to be an OoO bug I don't know if you can work around it.