Images in S-Controls not displaying when installed in Sandbox

I have a managed package application that includes a Document Folder with Images in it... and an S-Control that displays those images. The installation process correctly "re-maps" the image tags in the S-Control to point to the ID that corresponds to the proper Image as it exists in the installed org. (Which is a beautiful thing, by the way)

The problem is that this "re-mapping" does not happen correctly when the package is installed in a Sandbox org. The S-control is updated with some new strange IDs that DO NOT match the IDs of the correct images in the Documents folder... thus, the images do not display.

Has anyone experienced this, or know why this is happening and if there is anything that can be done?

If anyone would like to see what I am talking about... install the following app in a Sandbox org:

https://www.salesforce.com/appexchange/detail_overview.jsp?id=a0330000002gRJaAAM