Hello-
I am currently experiencing an infrequent issue with Excel 2013. When I have multiple spreadsheets open (usually 4 or more for comparisons) excel will randomly not let me type or switch to another spreadsheet until I press 'Enter' and then it tabs down on a random spreadsheet other than the one that I was looking at. I have tried to reinstall office and even swapped keyboards to try to resolve the issue. Any further guidance would be of great assistance.