With the 32bit floating active, I am seeing some blur/jumping/minor pixelation in the rendered output (HDV 1080/60i). It is usually about 8 or 10 frames long and SEEMS to be random. In a 5 minute test strip the problem occurred about 7 times. In 8 bit mode the ouput was fine.
I had a problem with my renders being blurry not sporatically, but all the time. Vegas 8 crashed though when I tried to open it after having opened Vegas 6 once (who knows why), so I had to reinstall it. Hopefully that fixed the problem.