Q.My Ice Plant Looks Like Melting And Smells. Eventually Dying. At First One Area And Now All
Maybe rot, or too much fertilizer? It is Disney type, white flowers. Never problem before.started one area, now looks like losing all. Fungus? Little white flying bugs. Slimy green, then yellow and gray.

Certified GKH Gardening Expert
Perhaps the plant has been overwatered or you've experienced more rainfall than usual. Ice plant doesn't like to get waterlogged. These plants can suffer from downy mildew and, you're right, it is a fungus. Too much water will cause Ice Plant to develop root rot and subsequent death. I would dispose of it completely and wait a while before planting more. You may want to sterilize the soil, as well.https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/sterilizing-soil.htm
Check on your growing conditions here: https://www.gardeningknowhow.com/ornamental/flowers/ice-plant/growing-hardy-ice-plant.htm