I don't know if you ever resolved this, but the problem almost certainly lies with the "Share Permissions" for the folder(s) that you've shared.
By default, folders are shared with "Everyone" having "Read" access only. "Change" and "Full Control" are disabled.
Right click a folder you've shared and select Properties, then the Sharing tab. Click the Advanced Sharing button. If the box to "Share this folder isn't ticked, then tick it. Click the Permissions button and, for "Everyone" tick the Full Control box in the "Allow" column.