VBA count color code not working properly with some blank cells - vba

Question

I have the following count color code, which is working fine until the range contains blank cells, for which you have to go in the function line and press enter, then the change into different kind of blank cells it seems, as i spotted the errors and everytime i do the step, the vba code is working again. How can I either correct the vba code so I can step this manual enter process for some blank cells, or is there an code that does the manual process for a certain range automatically?
Public Function SumByColor(pRange1 As Range, pRange2 As Range) As Double
'Update 20140210
Application.Volatile
Dim rng As Range
Dim xTotal As Double
xTotal = 0
For Each rng In pRange1
If rng.Font.Color = pRange2.Font.Color Then
xTotal = xTotal + rng.Value
End If
Next
SumByColor = xTotal
End Function

Answer 1

Your function work for me. I don't know what settings do you have, but try mine modification:
Public Function SumByColor(pRange1 As Range, pRange2 As Range) As Double
'Update 20140210
Application.Volatile
Dim rng As Range
Dim rngSum As Range
For Each rng In pRange1
If rng.Font.Color = pRange2.Font.Color And IsNumeric(rng.Value) Then
If rngSum Is Nothing Then
Set rngSum = rng
Else
Set rngSum = Union(rngSum, rng)
End If
End If
Next
SumByColor = WorksheetFunction.Sum(rngSum)
End Function
There is issue however for both mine and your version. It won't recalculate if you change font color for any cell. You must click Calculate Now in Formulas menu.