Hi Debster,
I am fine with both maltodextrin and modified maize starch, but I thought they were both maize (corn) derivatives not wheat?
See this link for details of maltodextrin which includes the statement "Corn-based maltodextrins are safe for patients with celiac disease since they do not contain proteins from wheat, barley, oats or rye"
http://www.grainprocessing.com/food/malinfo.html (sorry, I don't know how to do the link thing!).
Either way, I'm not sure if mine is wheat proteins (as this should have shown up in tests), but everyone is different and I have discovered that none of this is straightforward!!