So I've got an Excel 2010 .xlsm file that has a strange blue dot in bottom right corner of the cell. It is not a Tracer Arrow of any sort, or a Fill Handle or any other object that I can click to "Select". I've tried closing Excel and re-booting my PC but it still remains. I can copy another cell to it and it still remains. I can delete the row from the Table and the blue dot appears to move up to the cell above it, and I can Delete the column and the blue dot moves to the adjacent column. I've tried copying the sheet to a new book and the blue dot appears there, too. I've attached a screen shot of this anomaly (in Cell CI505).
Is this is a sign of corruption in the file? And how can I get rid of this?