I am having issues with a spreadsheet not referencing all the data points in a seperate workbook. I have verified that the function works because if I change the reference name to one that is working, the data is pulled through (ex. "Flow Meter I S" works but "Flow Meter I F" does not. I am currently referencing about 174,000 unique sample points on the one worksheet with about another 174,000 in total on all of the other worksheets. Any feedback would be appreciated.