You may not have this file:
workspace\.metadata\.plugins\org.eclipse.core.runtime\.settings\org.cfeclipse.cfml.prefs
It needs to be there with this line in it:
lineNumberRuler=true
Have you restarted Eclipse with the -clean flag?
I can't remember exactly what the -clean flag actually does, but it
can help to prevent odd things happening.
It slows down Eclipse startup a lttle, so if that bothers you then
remove the -clean bit again, but personally I just leave mine on.
I should also say, it's not guaranteed to fix this problem
specifically - but it might do, and it can't hurt to try it.