Can't write to shared folders from network after Windows 10

I upgraded a workstation to Win 10 Pro.  The system, System X, has two admin users, A and B.  A is logged on to System X.   Volume C is shared from the root on System X,  All admins on the system have permissions to Share C with full control.  B is logged on to another system, System Y (Win 8.1).  B can access (read) almost all folders on System X from System Y, but cannot write to the folders as he did in the past.  I attached a screenshot of the sharing options, which are the same for all networks.  Thanks.
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JohnBusiness Consultant (Owner)Commented:
Down at the bottom of your screenshot, turn Password Protected Sharing ON. Works best all around.
sjw601Author Commented:
Thanks.  I found that, when I accessed System X from a desktop shortcut on System Y, I had the problem.  I did not have the problem when accessing System X from Explorer\Network on System Y.  I rebuilt the shortcut, and things seem okay.  I played with Password Protected sharing, but it didn't seem to matter.  I do have Network Discovery off under Private and Public Networks, but that doesn't seem to make a difference, either.  

One issue remains.  I cant write to System X\Users from System Y, as I could before.
JohnBusiness Consultant (Owner)Commented:
Perhaps remake any shortcuts (that is, delete the current shortcut and make a new one).

On all my systems I have Network Discovery ON, File and Print Sharing ON, Homegroup OFF, Password Protected Sharing ON, and make sure firewalls allow the other systems. Make sure the NIC is set to Private (or Domain) and not Public.

Set in this way, I can always share and write.

Make sure in your case, permissions to the applicable folder are set to Modify.
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sjw601Author Commented:
Thanks again.  I set my system to the same settings that you have.  It doesn't seem to make a difference, as I was able to read/write before I did so.  However, I still can't write to the Users tree, even though I granted Full Control explicity.
JohnBusiness Consultant (Owner)Commented:
If you are trying to use the Users folders (which are restricted and protected), then you may need to use Homegroup.

Make sure Homegroup is enabled on both machines. Go to Control Panel, Homegroup, and delete/remake Homegroup connections on both machines.

If it worked before AND if you were writing to Users folders, then you must have been using Homegroup. Remove and remake ALL Homegroup connections and it should work again.
sjw601Author Commented:
I wasn't using a Homegroup before.  I just looked a machine from which I had accessed the Users tree before, and it is not joined to a Homegroup.   The only other thing that I can think of is that I did not actually write to Users, but read from that tree, if it actually was impossible to do so.
JohnBusiness Consultant (Owner)Commented:
The only way to read AND write to/from USERS folders in Windows 7 and above is via Homegroup.  Windows 10 security is tougher than Windows 7 and so may be the cause of your issue.

I do not read/write to/from USERS folders - I use neutral folders for sharing and that all works. My laptop is Windows 10 Pro and my desktop (for a month or two more) is Windows 7 Pro.

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JohnBusiness Consultant (Owner)Commented:
@sjw601 - Thanks and good luck with sharing folders.

I do have an article on modern folder sharing that also may be worth a read.
sjw601Author Commented:
Thanks for the help.  I did just find that I can write to the Win 7 Users tree from my Win 10 system.  This is still without any Homegroup.  The settings are the same, so I'm guessing there's something on Win 10 that's not in Win 7.
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