Vista - WLM Personal background won't stay

Hi There,

I'm running Vista Home Premium on my new system. I have Windows Live messenger and in each chat window there is an option to set the background for that particular window. When I click browse to select and image file from my computer there is also an option to set this image to the default background for all windows and will then be the messenger's default back ground for chat windows/ I select my image and set it to default however, as soon as I log off of messenger, or exit the messenger program or even have a brief disconnected the default is reset to no background at all even when I chose the image and told it to be the default. Is there a way to fix this? I never had this problem on my old xp computer, the backgrounds would always stay fine through log-offs, disconnected and program exit. Because this was not a problem with xp I suspect it is a vista problem. Can anyone help me out with this? Can I fix it so that the background I choose as default will stay the default after disconnects, log-off and program exits?

I appreciate any help.

Thanks