Well, Fairestcape, I think I found the problem. Seems that everywhere that there's a problem, I'm finding (in the product description) this "mso-spacerun", which in turn, is also giving me css validation errors. If you search for "mso-spacerun", you'll find NOTHING but sites with this in their html. I finally searched for "mso properties" and found that this is coming from Microsoft Office (should have known), which I think my client uses to write his product descriptions with.

Now, in knowing all this, is there a way to get rid of all that at one time, or will all the "offending" product descriptions have to be re-written to straighten all this out?