This question already has an answer here:
I am already aware of how to set a custom logon background on Windows 7. I am also not trying to tile my plain wallpaper on my desktop. I am talking about the background on the logon/lock screen in Windows 7.
What happens is on machines that have multiple monitors with custom logon screens only the main monitor that has the logon screen will display a custom oem background - every other monitor is black and I think that is gross. The blacked out monitor screens still display the cursor but do not have a background on them.
Is there any tweak to make this happen or is this truly a limitation of Windows 7?