Thanks Mathias, I suspected already I had something in there incorrect, but I'm not sure what. I did update the code to clean up a little (changed reference information in the commented fields) - edited above, but it was only commented stuff. I double checked the script from Spell Blending and other than my piping in the Cleric class and changing the "not" to Dread Necromancer instead of Magus, I can't see what I've gotten wrong/different.
Code:
~ generate the expression saying what spells we're able to search for
~ we're looking for spells that are wizard spells but not magus spells and
~ are of a level we can cast
field[usrCandid1].text = "component.BaseSpell & sClass.cHelpWiz & !sClass.cHelpMag & (val:sLevel.? <= " & linkage[table].field[cMaxSpLev].value & ")"
~ whether this is the one spell version or the two spell version is
~ extraneous now that we've chosen it
field[livename].text = "Spell Blending"
Here's the base code I copied/tweaked.