It is unusual that a property stays in contract for over 2 months without closing. There is a possiblity that there is an issue with the buyers financing. I would be happy to check with the owners agent to see what the story is.
Also, were you aware that you can have a buyers agent assist you in touring any home for sale in Arlington so you do not have to wait on open houses? Feel free to email me if you would like for me to investigate further.