I found that if I drew a selection box around the invisible marker that it would appear as a tiny yellow box. Then if I right clicked the yellow box a popup menu would appear giving me a couple choices of "alignment" and nothing else. I clicked one of the alignment options in desperation. After doing that the marker turned black and stayed that way. Its right click menu then functioned normally.
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Another way of forcing the marker to appear is to enter text in the value field of the block, a PITA.
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Am I overlooking something or does this area need a little work?
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The train tracking itself is working great.
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George
George Hofmann