Hi, sparcle!
Even I'm using 2010 version, I think that's not a problem with your file as I downloaded and opened it, then proceeded as wrote in my previous post and it worked.
I know you tried it yet, but give another try and:
- close all Excel instances that might be running
- start Excel
- open the uploaded file tr.xlsx
- it will display sheet Innova
- select cell M6
- check if you see the bottom right small black square
- a) if yes, double click on it (your mouse cursor becomes a plus sign), and check that M6 is copied thru M10
- b) if not, proceed as shailyog previously wrote, and then repeat these steps:
"in excel 2010-
file>option>advanced>under "Editing Options">tick "enable fill handle and cell drag and drop"
If that works, and never gets repeated, don't worry, something wrongly set, but if it happens again, there's a workbook that's changing your settings, try to identify it (it should end in .xls, .xlsb, .xlsm, but not .xlsx).
If that doesn't work, well, I think you'll have to consider getting online support. Do you use LogMeIn or TeamViewer or any other remote assistance software?
Regards!