Win7 "net use" by ip address works, while computer name doesn't
Finally got this one solved! Thanks to Joining Windows 7 Homegroup breaks connections to shares
The solution is turn off Homegroup sharing, and leave the Homegroup. After that folders can be shared via: select folder >> r-click >> properties >> sharing >> advanced sharing >> [x] share this folder >> permissions
Note: "select folder >> r-click >> share >> ..." gave an error and did not work, and neither does ... >> properties >> [share].