Pathping results posted below. I ran it a couple of days ago when first looking at your post and noticed the 100% loss at the "me" side of the UBR. IMO that's a firewall issue blocking ICMP packets. You'll notice that they are in fact, sent.
IMO, Pathping won't tell you why you stall at 99%.
There is a good article on Pathping here:
http://www.windowsnetworking.com/art...-Pathping.html
The other thing you need to know is that your upload is either FTP or TCP. With FTP and TCP there is no packet loss - only re-transmissions.
Can you let us know your PC type, OS and anti-virus/anti-malware solutions you have running? This is going to be a difficult one, I think.
Tracing route to up.flickr.a00.yahoodns.net [209.191.121.31]
over a maximum of 30 hops:
0 Sephiroth-PC [192.168.1.13]
1 my.router [192.168.1.1]
2 10.159.48.1
3 winn-core-1a-ge-114-954.network.virginmedia.net [62.253.121.73]
4 win-bb-a-so-130-0.network.virginmedia.net [62.253.184.113]
5 bir-bb-b-so-010-0.network.virginmedia.net [62.253.188.146]
6 bir-bb-a-ae0-0.network.virginmedia.net [62.253.185.153]
7 nth-bb-b-ae2-0.network.virginmedia.net [62.253.185.85]
8 tele-ic-1-as0-0.network.virginmedia.net [62.253.184.2]
9 70-14-250-212.static.virginmedia.com [212.250.14.70]
10 so-1-0-0.pat1.nyc.yahoo.com [66.196.65.13]
11 so-3-0-0.pat1.dcp.yahoo.com [216.115.101.157]
12 ae-4.pat2.dcp.yahoo.com [216.115.102.119]
13 as-0.pat2.da3.yahoo.com [216.115.101.155]
14 ae1-p121.msr1.mud.yahoo.com [216.115.104.83]
15 v204.bas4.mud.yahoo.com [68.142.209.7]
16 up.flickr.vip.mud.yahoo.com [209.191.121.31]
Computing statistics for 400 seconds...
Source to Here This Node/Link
Hop RTT Lost/Sent = Pct Lost/Sent = Pct Address
0 Sephiroth-PC [192.168.1.13]
0/ 100 = 0% |
1 2ms 0/ 100 = 0% 0/ 100 = 0% my.router [192.168.1.1]
0/ 100 = 0% |
2 --- 100/ 100 =100% 100/ 100 =100% 10.159.48.1
0/ 100 = 0% |
3 13ms 0/ 100 = 0% 0/ 100 = 0% winn-core-1a-ge-114-954.network.virginmedia.net [62.253.121.73]
0/ 100 = 0% |
4 16ms 0/ 100 = 0% 0/ 100 = 0% win-bb-a-so-130-0.network.virginmedia.net [62.253.184.113]
0/ 100 = 0% |
5 19ms 0/ 100 = 0% 0/ 100 = 0% bir-bb-b-so-010-0.network.virginmedia.net [62.253.188.146]
0/ 100 = 0% |
6 19ms 0/ 100 = 0% 0/ 100 = 0% bir-bb-a-ae0-0.network.virginmedia.net [62.253.185.153]
0/ 100 = 0% |
7 24ms 0/ 100 = 0% 0/ 100 = 0% nth-bb-b-ae2-0.network.virginmedia.net [62.253.185.85]
0/ 100 = 0% |
8 20ms 0/ 100 = 0% 0/ 100 = 0% tele-ic-1-as0-0.network.virginmedia.net [62.253.184.2]
0/ 100 = 0% |
9 21ms 0/ 100 = 0% 0/ 100 = 0% 70-14-250-212.static.virginmedia.com [212.250.14.70]
0/ 100 = 0% |
10 114ms 0/ 100 = 0% 0/ 100 = 0% so-1-0-0.pat1.nyc.yahoo.com [66.196.65.13]
0/ 100 = 0% |
11 116ms 0/ 100 = 0% 0/ 100 = 0% so-3-0-0.pat1.dcp.yahoo.com [216.115.101.157]
0/ 100 = 0% |
12 116ms 0/ 100 = 0% 0/ 100 = 0% ae-4.pat2.dcp.yahoo.com [216.115.102.119]
0/ 100 = 0% |
13 160ms 0/ 100 = 0% 0/ 100 = 0% as-0.pat2.da3.yahoo.com [216.115.101.155]
0/ 100 = 0% |
14 162ms 0/ 100 = 0% 0/ 100 = 0% ae1-p121.msr1.mud.yahoo.com [216.115.104.83]
0/ 100 = 0% |
15 154ms 0/ 100 = 0% 0/ 100 = 0% v204.bas4.mud.yahoo.com [68.142.209.7]
0/ 100 = 0% |
16 163ms 0/ 100 = 0% 0/ 100 = 0% up.flickr.vip.mud.yahoo.com [209.191.121.31]
Trace complete.