I’m not sure if this issue is covered anywhere else, but I searched all day for a solution and didn’t find anything.
Nonetheless, I finally figured it out.
So, yesterday I purchased Windows 8 as an update over my Windows 7. Untill then, I used my WDTV with Network Shares, logging in with my Windows 7 account. Everything worked perfectly.
When Windows 8 was fully installed (with all settings and apps kept), I wasn’t able to log in with my WDTV. It was due to the fact, that Win8 merged my local account with my Windows Live ID. So I had only my Live ID as my Windows account. Afters ours of tweaking sharing options and all other sorts of stuff, I only managed to log in with the Live ID through the WDTV, but only get some sharing capabilities.
Of course the solution was very, very simple… I just needed to create a new local account and use it for the WDTV.
Just to mention, that sharing to everyone, or removing the password protected sharing, didn’t helped at all. They only enabled partial sharing capability, mainly being “Play to” and some generic Music, Videos, Photos, Users and stuff, but always empty and not really working.
Hope this helped a bit for the Win 8 users