Chuck,
In many cases they are not really missing. You may have an extra texture.txt file that references the image file. This comes about because many content creators copy the folder of an existing asset and then change out files and edit the config to make a new asset. This leaves behind unneeded files. Before TRS2006, Trainz didn't care about these unneeded files. Now they are seen as faulty. In most cases, you can safely delete texture.txt file that begins with the name of the missing graphic file.
does that make sense?
William
