Every update overrides custom images you may have used. Please keep a backup copy and restore them after every update.
This particular image you can (now) turn off - use Portal Edit page.
You can find the image in the "images" directory of production and master components in Tomcat. It is called poweredby.gif
Every time you update the binaries you need to overwrite images
you have customized. There is an easy way to do this:
1. Create a separate directory that mirrors directory structure of deployment
2. Only include your customized images in that directory structure
3. After every update of binaries, copy this directory over top of the
deployment directory to overwrite the files
Thanks, Matt and Pavel.
It worked.