Underline import failure

[Andrew Parsloe]

Create a LyX document which uses underline and export as Latex. Now 
import the Latex document. The underline is not 'swallowed' by LyX and 
shown as underline, but remains in ERT. Also, the document doesn't 
compile. However, if another word is now underlined, then the document 
does compile, and the earlier word which caused the problem is correctly 
underlined in the pdf.

LyX 2.0, Windows Vista.
Andrew