I am running release 5 on my mac air i5 windows system. There are 8 active connections, but there are only 2 blocks synchronized after half an hour, so what's the matter?
You can try restarting the client, or here are some nodes you can try adding:

[
{
"addr" : "107.20.106.184:60473",
"services" : "00000001",
"lastsend" : 1373556327,
"lastrecv" : 1373556327,
"bytessent" : 63288,
"bytesrecv" : 36507,
"conntime" : 1373555320,
"version" : 70001,
"subver" : "/Satoshi:0.8.3/",
"inbound" : true,
"startingheight" : 13993,
"banscore" : 0,
"syncnode" : true
},
{
"addr" : "98.219.165.39:9911",
"services" : "00000001",
"lastsend" : 1373556327,
"lastrecv" : 1373556327,
"bytessent" : 25598,
"bytesrecv" : 75762,
"conntime" : 1373555322,
"version" : 70001,
"subver" : "/Satoshi:0.8.3/",
"inbound" : false,
"startingheight" : 13993,
"banscore" : 0
},
{
"addr" : "54.213.28.70:9911",
"services" : "00000001",
"lastsend" : 1373556327,
"lastrecv" : 1373556327,
"bytessent" : 36559,
"bytesrecv" : 68788,
"conntime" : 1373555334,
"version" : 70001,
"subver" : "/Satoshi:0.8.3/",
"inbound" : false,
"startingheight" : 13993,
"banscore" : 0
},
{
"addr" : "192.241.214.21:9911",
"services" : "00000001",
"lastsend" : 1373556327,
"lastrecv" : 1373556327,
"bytessent" : 22688,
"bytesrecv" : 56760,
"conntime" : 1373555340,
"version" : 70001,
"subver" : "/Satoshi:0.8.3/",
"inbound" : false,
"startingheight" : 13993,
"banscore" : 0
},
{
"addr" : "24.10.168.55:9911",
"services" : "00000001",
"lastsend" : 1373556296,
"lastrecv" : 1373556327,
"bytessent" : 30046,
"bytesrecv" : 68261,
"conntime" : 1373555352,
"version" : 70001,
"subver" : "/Satoshi:0.8.3/",
"inbound" : false,
"startingheight" : 13994,
"banscore" : 0
},
{
"addr" : "108.61.83.36:9911",
"services" : "00000001",
"lastsend" : 1373556327,
"lastrecv" : 1373556327,
"bytessent" : 17895,
"bytesrecv" : 105600,
"conntime" : 1373555352,
"version" : 70001,
"subver" : "/Satoshi:0.8.3/",
"inbound" : false,
"startingheight" : 13994,
"banscore" : 0
},
{
"addr" : "54.227.32.16:9911",
"services" : "00000001",
"lastsend" : 1373556327,
"lastrecv" : 1373556327,
"bytessent" : 15863,
"bytesrecv" : 95758,
"conntime" : 1373555353,
"version" : 70001,
"subver" : "/Satoshi:0.8.3/",
"inbound" : false,
"startingheight" : 13994,
"banscore" : 0
},
{
"addr" : "54.226.7.107:9911",
"services" : "00000001",
"lastsend" : 1373556327,
"lastrecv" : 1373556327,
"bytessent" : 31277,
"bytesrecv" : 77355,
"conntime" : 1373555360,
"version" : 70001,
"subver" : "/Satoshi:0.8.3/",
"inbound" : false,
"startingheight" : 13994,
"banscore" : 0
},
{
"addr" : "72.46.156.122:9911",
"services" : "00000001",
"lastsend" : 1373556327,
"lastrecv" : 1373556327,
"bytessent" : 33140,
"bytesrecv" : 72157,
"conntime" : 1373555372,
"version" : 70001,
"subver" : "/Satoshi:0.8.3/",
"inbound" : false,
"startingheight" : 13996,
"banscore" : 0
},
{
"addr" : "65.29.242.236:51193",
"services" : "00000001",
"lastsend" : 1373556327,
"lastrecv" : 1373556327,
"bytessent" : 55446,
"bytesrecv" : 5329,
"conntime" : 1373555934,
"version" : 70001,
"subver" : "/Satoshi:0.8.3/",
"inbound" : true,
"startingheight" : 14052,
"banscore" : 0
},
{
"addr" : "69.157.140.80:61385",
"services" : "00000001",
"lastsend" : 1373556327,
"lastrecv" : 1373556297,
"bytessent" : 47121,
"bytesrecv" : 1008,
"conntime" : 1373556190,
"version" : 70001,
"subver" : "/Satoshi:0.8.3/",
"inbound" : true,
"startingheight" : 14070,
"banscore" : 0
},
{
"addr" : "184.58.176.59:54330",
"services" : "00000001",
"lastsend" : 1373556327,
"lastrecv" : 1373556327,
"bytessent" : 47836,
"bytesrecv" : 953,
"conntime" : 1373556217,
"version" : 70001,
"subver" : "/Satoshi:0.8.3/",
"inbound" : true,
"startingheight" : 14071,
"banscore" : 0
}
]