Q: Mac won't connect to Windows when trying to use Home Sharing

Hi, I'm having trouble with my Home Sharing on iTunes.
I recently got a new Macbook Pro - it's all up to date and I'm also running the latest version of iTunes on it.

I've been trying to move my music over to this computer from my old Windows PC via Home Sharing. However, my windows will connect to the iTunes on my Mac, but the Mac will not do the same with my Windows if this makes sense: it shows a loading screen but then just goes back to its own library, but still says that the windows' library is available.

I've tried restarting both computers; turning Home Sharing on and off; authorising and deauthorising both but to no avail. My windows is also running an up to date iTunes.

I'd be grateful for any advice, thanks in advance.