heh, I just replied in another thread about this same issue, and I am glad to find that others are having this issue with their 655. Well, not glad its a problem, just that its not isolated to myself and a few others.
Earlier tonight, I went to the DIR-655 product page, and found that 1.33NA firmware is now released and available. I just upgraded about an hour ago, and will observe this issue overnight.
Maybe if enough of us get to making noise, D-Link will take a look, because this bug renders the Shareport feature as useless, and its a problem in their firmware for the 655, not the utility or our OS's.