Cracked a tough nut in Excel this evening. Arrays powerful things, but the sorcery behind the formulas befuddles me at times. I struggled for about two hours to nail one error that was tossing all my arrays into chaos. Turned out the problem lay in the VLOOKUP function that feeds data into a range, which is reference by the array. Took a while to track down that problem. I can go to sleep now and polish off the project first thing tomorrow at work. That is cool.