If you call "Instr" with a null argument as in "Instr("Whatever","")" you always get back a 1.
It should return a 0 indicateing that it didn't match anything.
My solution:Function In_Str(Look_In, For_Text) ' Correcting "Instr" function.
' 7/3/18 Created. WML
Prog = "In_Str"...