I was having the same problem since your upgrades. From the command prompt, I typed: tracert www.geocaching.com and it would come up with the old IP address. Example:
C:\>tracert www.geocaching.com
Tracing route to www.geocaching.com [63.251.163.181]
As you can see the tracert came up with an old IP.
First I want to thank Michael, Ed and everyone at Groundspeak for helping me work on this problem. They were fantastic. They took the time to show me what was wrong and what I had to do to fix the problem.
I called my service provider and lead them thru this process and they understood they had a problem. I just finally got on today. I did another tracert and now this is what is says:
C:\>tracert www.geocaching.com
Tracing route to www.geocaching.com [66.150.167.149]
Now you can see my service provider corrected there problem and it now has the correct IP for www.geocaching.com
Thanks again for all the help on getting this problem straigned out.
Happy Geocaching .......legna and sOulbAit