There is an issue with boot images disappearing from the WDS console once you have closed the console. This is usually when you have added drivers to the boot.wim using the AIK.
Answer: Ensure you are mounting the correct Index before injecting drivers. You need to select Index 2 rather than Index 1 when using a boot.wim from Windows 7/2008 media. Index 1 is for WinPE only.