Windows 7 PRO Workgroup Not Showing Shares to all Users

I have inherited a client that has 13 computers connected as a Workgroup all running Windows 7 Pro.  I would have advised them long ago to get a server, but not in the budget for them right now....  The problem seems to lie with the Windows 7 Pro PC that is acting as the host (server) for all of their shares.  One person will upload a new pictures to the server but only he can see the uploaded files for 1 to several days.  Even if I go to the server itself, I cannot see what he has uploaded.  However, from his desktop, the files are located at //server/shares/pictures....  After a couple of days, the files "magically" appear for everyone else.  I have already tried the following registry edits that I gleaned from other posts...

HKLM\System\CurrentControlSet\Control\Session Manager\Memory Management----changing LargeSystemCache to 1

HKLM\System\CurrentControlSet\services\LanmanServer\Parameters----Changing size to 3

Any suggestions would be greatly appreciated.  This is a small town newspaper and making deadlines having to sneaker net pictures and files is getting old really fast.
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Try disabling the firewall service on the Windows 7 machines, not just turn off but disable the service so that it doesn't start
TechnologyDoctorAuthor Commented:
Won't that leave them extremely vulnerable?
In short yes, however its a great troubleshooting step and narrows down what may or may not be broken.
if the pictures appear right away, you have to alter the firewall rules to allow the file sharing for all the computers, this will test whether you have the network configured correctly. In windows 7 the firewall disables most things by default, when you add file sharing it opens default values they may or may not be the correct values, quick easy test is to disable the service, and then upload new files, and see if they appear right away.
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TechnologyDoctorAuthor Commented:
Thanks, I'll drop by and try on Monday.
TechnologyDoctorAuthor Commented:
Sorry for the delay in follow up, but the firewall fix didn't change anything.  However, I stumbled upon the following fix...

Registry Edit:
HKLM\System\CurrentControlSet\Control\Lsa|LMCompatibilityLevel  -- Change Value to 1

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