I have Excel 2011 for mac, bought this year (2013). Sometimes the program starts complaining when I rename a sheet. The program says (translated from Swedish) that the name should not have any strange character like / etc. So I try with any short simple name (like x, test, ...) but with the same answer.
I guess the file is corrupt in some way causing this problem. What is the root cause? How to solve?
Best regards
Pejle