Tested on Apache OpenOffice Writer with last (2.1) release of LT using default settings.
Create a Writer document and set the language to Spanish. Then paste this text
Este texto es parte de la «ayuda emergente» de Writer y está relacionado con el pequeño mensaje que aparece cuando colocamos el cursor sobre un botón en cualquier barra de herramientas o el recuadro que aparece con el contenido de una nota al pie de página cuando nos colocamos sobre el número que la representa.
LT will underline from "relacionado con..." up to "...una nota al". A right click over the marked text say that "relacionado al" do not exist on Spanish language, which is right, but it seems that LT is omitting the text from "con" up to "nota". This is a serious problem because if you select the suggested correction, all the text between "con" and "pie" will be erased.
That happens because the rule is too greedy. The way to fix that is changing the skip section. I'll do that shortly.
Solved.