At home, I saved a workbook in an FTP folder provided by Hostrator. I can
open and modify (i.e. resave) this workbook without problems at home.

While I can open the same workbook at my work place, I cannot modify it - it
always opens as Read-Only despite the file permissions being loosen to allow
everyone read, write, and execute access.

What could be the cause of this Read-Only problem (there's definitely nobody
else who's got the workbook open simultaneously). If you've had this problem
before (not necessarily with Hostrator but at any other FTP site) and
managed to overcome the problem, I would love to hear from you.

Thanks.