Files are in READ ONLY mode

I have a file server 2003 with shared folders. I have " FULL CONTROL" on all the folders. However, when someone else saves a document in one of the folders, it opens in READ ONLY mode on my Windows 7 machine, Office 2013. When I log into the server itself, I can make any changes to the file. Not from my windows 7. 

any ideas?

thanks