Have you refreshed the folders after adding them?
As well, have you checked compatibility for the files? If not, please post back the full model number for your unit and let me know if this worked for you.
I just purchased a C5500 and have it connected via a hard wired internet connection. Firmware is updated. Running version 4.2 of PC Share manager and sharing 3 folders that contain MKV files.
I set the device policy in the software to allow the C5500 to see the folders.
When I go C5500 and change device to the "PC Share Manager" I see the 3 shared folders, but the folders are all empty. Spent an hour on the phone with Samsung support with no help other than a product specialist will call me back in 24-48 hours.
The MKV files play fine when I copy them to a USB drive and play them thru the USB port from the C5500.
I even turned off my windows fire wall and had the same results (prior settings were firewall on with a notification when the firewall blocked a new program).
Any help would be appreciated.