I retested the formula
=if(isna(INDEX(E41:E51,MATCH(9.999999999E+307,E41:E51))),"", INDEX(E41:E51,MATCH(9.999999999E+307,E41:E51)))
on the original sheet and reentered the reference to it and it reports a value or a blank, so it's all good. Thanks so much kpuls and gsouza!
pehl