My Excel file crashes whenever I attempt to make a copy of a tab, within the same workbook, and then save. This problem only occurs with its existing naming convention. In other words, the file crashes with the name "Cash Flow Model 5 Year Plan". If I rename the file to "Copy of Cash Flow Model 5 Year Plan" then it works perfectly, with no issues copying a tab within the workbook. The file size is not too large, as this issue never occurred when the model was twice the size. Does anyone have any ideas?

Thanks!

Kevin