However any issues with video dreams will be codec issues.
In my testing with Windows 8.1 Pro x64 RTM with Media Center, I've found this isn't the case. I'm capable of doing testing with video dreams by converting the MPEG-2 video dreams to other video formats (e.g MPEG-2 to WMV, AVI, etc.) and I can pretty much say the codecs isn't the issue. Windows 8.1 RTM without Media Center works perfectly with WMV video dreams for example. However, the second I add Media Center no dreams, not even the default ones provided with DeskScapes, will load at all. DeskScapes can't even apply normal wallpaper images after Media Center is added too. It either blacks out the background or doesn't do anything at all.
To test, I even did a clean Windows 8.1 RTM install and immediately added DeskScapes, and it works perfectly. But when I added Media Center, it just refuses to work. So Media Center is probably the key here. Just in case, this is my Windows 8.1 Pro RTM clean install procedure...
1. Install Windows 8.1 Pro x64 RTM using the default install key when asked (not using my legit Windows 8 key yet, just the default one so it'll install but not activate).
2. When Windows 8.1 Pro is booted, activate Windows 8.1 Pro using my legit Windows 8 key via the phone activation method.
3. After rebooting and verifying my Windows is activated, I install DeskScapes to confirm everything is working fine. I even reboot a few times and all is still well. All dreams, videos and wallpapers work just fine.
4. I then upgrade to Media Center (via the add features to Windows feature in the Control Panel) using my legit 8.1 WMC key when prompted, then rebooting a few times to let it install. After Media Center is successfully added, I have to re-verify the activation of Windows and when that's taken care of, I'm activated once again with only this time as Windows 8.1 Pro with Media Center RTM x64.
5. DeskScapes, however is now broken. No matter what I do, no dreams, videos or wallpapers of any kind will load or can be applied once Media Center is installed and activated. The previews in DeskScapes for dreams, videos and wallpapers works fine. Sometimes when trying to apply a dream/video/wallpaper, the background blacks out suggesting that it's a codec issue. Installing codec packs and things as such doesn't make any difference and the fact that all dreams, videos and wallpapers worked completely fine before updating to Media Center suggest it's some sort of bug and not a codec issue at all.
So yeah, Media Center is indeed the key here to why it breaks. Keep in mind too that I'm not using MPEG-2 dreams/videos or trying to use them as I said above too. For my tests, I'm using dreams/videos that are encoded/created using the WMV codec that comes standard with Windows.