Guys, I can see this thread is old 4 years, anyway...
I had the same problem with refreshing SmartShare PC client, cuz it' was not showing the newly added videos.
Now, the refresh button in the right bottom corner actually doesn't do anything. To do a a refresh go to settings->My shared content-> and there is a refresh button in the right top corner. Apply->OK-Exit.
P.S. If you are downloading something in the shared folders, this refresh won't do anything, isntead it will refresing forever. So, first download, then refresh.