Unwanted underscore appearing under all text

I get unwanted underscore under ALL my text in sidebar 2 when my cursor floats anywhere except over sidebar 2. When my cursor is over sidebar 2 everything is OK. When I move the cursor the underscore reappears. You can even see a single underscore hashed at the beginning of each line at each skipped line between text paragraphs. This site worked fine for about two weeks until yesterday. Underscore also appears on any new pages if I add additional pages. Everything in sidebar 1 and header is OK….sidebar 2 is the only area affected. Anyone got any ideas?????