This applies to Excel for Mac as well as Windows. I have been an Excel user since 1993 and I build spreadsheets frequently. Most of my spreadsheets perform simple arithmatic operations - e.g. they utilize simple algebra and trigonometry formulas. Very rarely do I use Dynamic Array Functions. I use Range Names so that I can easily check my formulas. Within the last few weeks I have been getting "Spillage Errors" associated with Dynamic Arrays even though I did not use a Dynamic Array Function. These errors seem to be associated with my Range names. I've never had this in over 26 years as an Excel user. And I have been using reage names since I started. Is there a way to turn off these errors? Or are these Errors due ro errors within the Excel application?