Phew.....I feel for you Meaux!
I remember on another site I was a member on there was a huge discussion about this same topic. Lots of suggestions as to why all of a sudden a cat would start doing that, I was surprised to say the least!
I Googled and found this site which might give you some insight for your situation, hope it helps.
http://www.marvistavet.com/html/body...e_soiling.html
Life is like a 10 speed bike, we all have gears we never use.
Charles Schultz
"The bicycle is just as good company as most husbands and, when it gets old and shabby, a woman can dispose of it and get a new one without shocking the entire community." — Ann Strong, Minneapolis Tribune, 1895