Scenario can't find the Target Destination

[railduffer]

I am building my first Route. When I test it using a Free Roam Scenario everything works fine (signals and everything). I can easily go anywhere.
When I try to write a simple Standard Scenario the Red X comes up with different vague reasons why it doesn't work. When I try to load it from startup, the box with print so small I can hardly read it, says that it can't find the target destination (exit or edit).
Does anyone have a solution to this problem? Please!
Thanks for any suggestions.

[OldProf]

That may be an actual error or a false alarm due to who-knows-what-other glitches. First of all, verify the cache (I verified my cash yesterday: $2.15), check for blueprints.pak files, and try again. If that doesn't solve the problem, you may need to give our old frenemy the mythical dispatcher a few clues in the form of waypoints.