[tiermann]

The "unknown carrier" is just letting you know about the blank carrier line I forgot to take out of selections.txt. It'll stop doing that after you select a carrier from the dropdown list and save. It's not an error, just a warning.

The exception you get means the new "second splash" isn't quite ready yet, and yes, as a workaround you can place the welcomehead.96.png in your Patches folder for now.

Just to doublecheck for GGuru... What format is the image in that you're trying to use for second splash (jpg, gif, png, etc) and what size is it? second splash should usually be 320x320. Also, anything else you can tell us about the exception message would be helpful. Should be a message just above the buttons.