OK - I've solved my FFFFFFFF problem for myself. The problem was caused by my misunderstanding of the definition of the Digital Waveform Control mask. For the record, this is a 2-D array. One dimension refers to the plot number on the Control graph (0 is uppermost plot, 1 is the second down and so on). The second dimension says which bit of that plot is affected. The content of each element is used to select a bit from the source data array. I.e. mask element, E, at (N, M) affects bit M of plot N on the graph. The value of E (0 to 31 for 32-bit data array) selects the bit from the source data array. Expanding upon the LabView examples (as always) helps understanding.
I hope that helps someone!
And I thought it was more clever...
I'm still trying to get colors to work... Ric
hard.