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Pardon me if I miss the point, as this looks rather complicated but I'm only giving it a quick look-over. Does it work to move your first If expression inside the Dynamic as follows? holdIF[Dynamic[var_], Dynamic[boxes_]] := DynamicModule[{updateFunction}, InputField[ Dynamic[If[boxes === Null, boxes = ToBoxes[SetPrecision[var, 5]]]; boxes, {...

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