Dear Luke M, I tried to open the files different ways, but in vain. I probably have to reinstall the application. I also think that possibly it could be damaged by a virus. I cannot find a better explanation. Thanks again. Leo
Thank you very much for your advice. I closed everything, and opened again repeatedly various Excel files. All the same. After my post, the security alerted me that I have a Trojan. I cleaned up my PC, but the problem with Excel did not go away. Could this worm corrupt my application?
I cannot paste formulas in Paste Special. It only gives me options of Text or Unicode formats. I could copy and paste formulas in the past. I guess I pressed something unintentionally, and I cannot undo it. Please, help.