I am working on a macro-enabled workbook which will do several different checks for different things all on the same source data. I really would like to do the work within this workbook. The part of the program I'm working on now takes a list of URLs and checks the status. The URL is column G, say G2, and I enter =httpstatus(G2) into Cell H2. I've done this thousands of times without problems, but in this particular workbook I am getting a message saying the syntax of this name isn't correct. If I make a copy of the worksheet in a new book it works just fine. Other SeoTools functions work in the workbook, just the httpstatus is giving me trouble. I've included a picture of the message I get.