I use pretty much "default" front-page, but somehow about 2 weeks ago all "portfolio thumbnails" stop showing themselves on the front-page.
As you can see, under the text line "Our portfolio speaks louder than words" there is actually our portfolio items. They are correct. And they are clickable. But no thumbnails at all. There were there before, and after some time they just disappeared.
And in the same time, on the portfolio page itself ( http://imba-promotion.com/portfolio-3-columns/ ) everything is displayed correctly.