I am also having this problem on select dreams:
- Good Night Earth by Master Baron
- Grassy Field by Stardock
- Day and Night by Muckyman
- Big Blue Sea HD by sntXrrr
- Vista Ultimate Aurora HD by Daewon
All other dreams I have installed are functioning correctly (i.e. Winter Snow, Water Dream, Desktop Earth). As far as I can tell, the problem dreams appear to be video dreams. However, checking my installed codecs though Windows Media Player (Help>About>Technical Support) shows that Microsoft MPEG-2 Video Decoder (msmpeg2vdec.dll Version 11.0.6001.7000) is installed. I am not receiving a codec error but the 'full version is required to play this content' error. When I click on one of the affected dreams, the screen turns black, then there is about a two second delay before the error is displayed. Thank you in advance.
Furthermore,
Does anybody know if it is possible to span the dreams across multiple monitors? Such that all three of my monitors (given that I have two graphics cards) will each be displaying the same dream.
So that I can go from this:

To this:

Specifications:
Deskscapes: 2.50.067
OS: Vista Premium x64 SP1
GFX: 1x nVidia GeForce 6800; 1x nVidia GeForce 5200 (I know... 2x 9800GT's in the mail)
CPU: Intel Core2 Q6600 @ 2.4GHz
Mobo: nVidia nForce 680i
RAM: 4GB OCZ PC2-6400 DDR2