Connection issues after upgrade to Mountain Lion

Very strange internet connection problem here after upgrade to Mountain Lion.
I just upgraded MacBook (early 2009) to Mountain Lion. After upgrade, I'm having problems connecting to certain websites (ESPN, CNN, etc.), and I can't connect to the computer using LogMeIn.
BUT, I do have an internet connection. Skype works, Messages works, email works, some websites work. I tested using speedtest.net and it shows good download speed, but the upload speed is so slow that it can't even perform the test. A Windows PC on the same network works fine.
Next, I tested the MacBook on another wi-fi network at a coffee house, and everything works fine there!
So it might appear to be something wrong with the router? I have an Cisco (Linksys) E3200 and have upgraded to the latest firmware (1.0.4). But still doesn't work.
The firewall in Mountain Lion is turned off, and I temporarily turned off the firewall on the router and that didn't help, so doesn't appear to be any sort of firewall issue. I've never heard of an operating system being incompatible with a specific router anyway.
Can anyone thing of any setting or something in Mountain Lion that would causing internet connection problems with a specific router?

I don't know if this will 'fix' your problem, but have you tried the 10.8.5 Supplemental Update -> http://support.apple.com/kb/DL1686?
Clinton

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