Can't access several websites after last security update

Hello,
After upgrading both my Macbook Air mid 2011 and iMac 2008 (with SSD) both running Mountain Lion 10.8.4 to the last security fix, I can't access from any of those two computers a variety of websites, for example:
www.opennicproject.org
www.gentoo-el.org
www.adslgr.com
These are only three. Almost half of Google's results are blocked. Using the terminal utility I am able to resolv some of them but not actually 'ping' them. I get no ping replies. I can access all these websites from other computers or devices (iPhone/iPad/Ubuntu desktop/WindowsXP laptop) on the same LAN. This problem exists only in the 2 macs which are up-to-date. I am sure that this problem is related to latest security update I did a couple of days ago, to both computers.
I'd like to know if anyone who have all patches installed up to the latest OSX version (mountain lion 10.8.4) has the same issues and can ping/resolv/access these websites.
Note that although I can't access these websites directly using any direct network connection, I can access them using TOR browser bundle for mac, which means that something is going on at a computer level.
I have checked so far:
- Applicationn Apple's firewall is not creating the problem (disabled/enabled all)
- ipfw/PF is not running with any ruleset
- LittleSnitch blocks just a couple of annoying outgoing connections. Nothing there (I disabled/enabeld it, same thing).
- Other computers access the websites/ping them/etc.
- I can access websites using TOR.
NOTE: It's not just 3 websites, it's something like 1 out of 3 DuckDuckGo links.
Ideas and thoughts are welcomed!
Best Regards,
PA

From the Safari menu bar, select
Safari ▹ Preferences ▹ Extensions
Turn all extensions OFF and test. If the problem is resolved, turn extensions back ON and then disable them one or a few at a time until you find the culprit.
If you wish, you may be able to salvage the malfunctioning extension by uninstalling and reinstalling it. That will revert its settings to the defaults.

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The following was contributed by Fumiaki Kawashima.
The error message, "Error: The underlying task reported failure on exit (-9972)" is a serious filesystem error in the Mac OS X Core Foundation. The problem can also lead to other critical errors such as "Keys Out of Order," "Invalid node structure" and/or "Invalid sibling link." The causes and scenarios vary. Troubleshooting a solution may depend upon computer configuration and whether the -9972 error is accompanied by other critical errors. This issue can also lead up to a kernel panic. If the error occurs when an external FireWire device is connected, disconnect it until you verify the device's compatibility.
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* A folder with a flashing question mark may appear.
* A bad partition map may be reported.
* A target disk mode solution may not work.
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* The high level disk format (Standard format) may unable to perform.
* You may unable to re-initialize the hard drive.
* A disk physically malfunctions in the worst case.
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07. Invalid node structure
08. Overlapped extent allocation
09. Keys Out of Order
10. Invalid sibling link
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* Third-party FireWire device or enclosure, or other peripheral devices.
* Third-party mass storage drives or PCI card issues.
* Incompatible third-party kernel extensions.
* Mac OS X installer disc is improperly treated.
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If possible and needed, back up data before troubleshooting. Methods (4) and (5) are for Power Mac desktop computers other than G5 models. The best bet is method (4) if you encounter multiple bad errors.
1. Unplug the power cord. Disconnect all third-party hardware except Apple keyboard and mouse before you start.
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(1) Start up from Mac OS X 10.3.x Panther Full Install CD or DVD.
(2) Re-initialize and re-partition the hard drive. RECOMMENDATION: Select "Zero all data" option if "Invalid node structure" or "Keys Out of Order" error is detected.
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Method 2:
(1) Start up in Mac OS 9.2.2 and shut down the computer.
(2) Start up from a copy of a Disk Warrior bootable CD for Mac OS 9.2.2.
(3) Run DW to fix the damage(s).
Method 3:
(1) Unplug the computer.
(2) Find a second ATA drive and jumper it as MASTER. Jumper the hard drive in question as SLAVE. Verify the jumper pin settings.
(3) Install Mac OS 9.2.x system on the MASTER drive, and update it to Mac OS 9.2.2.
(4) Start up from Mac OS 9.2.2. Re-initialize and re-partition the damaged hard drive with Drive Setup using the "Zero all data" option. Unplug the computer and reconfigure the jumper pin setting on the repaired drive for MASTER and the second drive for SLAVE.
(5) Restart from Mac OS X 10.3 Panther full install CD. Re-initialize and re-partition the repaired drive to install Mac OS X 10.3. Update to Mac OS X 10.3.7 via Software Update. Repair the disk permissions after each Mac OS X 10.3 installation and Mac OS X 10.3.7 update.
You may want to try starting up from Mac OS 9.2.x Full Install CD instead of from (2) to (4).
Method 4:
(1) Find a desktop computer that has an ATA controller PCI card (SCSI environment) and has two hard drive bays. This will make your damaged drive appear as a quasi-SCSI hard drive. Mac OS 9.2.2 must be pre-installed on the computer. I recommend a host computer that installs an Ultra DMA/xxx or xxx (ATA-x) interface equal to or better than the damaged drive with backwards compatible.
(2) Set the host computer's primary drive as MASTER and your damaged hard drive as SLAVE and install the damaged drive in the second drive bay of the host computer. Verify properly configured jumper pin settings in advance.
(3) Start up the host computer from Mac OS 9.2.2. Launch the "Drive Setup" utility. Re-initialize the damaged disk on the second drive using the "Low level format" option. It may take hours but less than "Zero all data" option. Note: Normally, a low level format with a quasi-SCSI drive takes much less (30 - 40%) time than an ATA configuration drive. Note that "Low level format" fixes all difficult logical damage.
(4) Put the fixed disk back in your computer's drive bay. Re-configure the jumper pin setting to MASTER before you place it into the drive bay of your computer.
(5) Restart from Mac OS X 10.3 Panther full install CD. Re-initialize and re-partition it to install Mac OS X 10.3. Update to Mac OS X 10.3.7 via Software Update. Repair the disk permissions after each Mac OS X 10.3 installation and Mac OS X 10.3.7 update.
Note that Panther's Disk Utility does not implement a "Low level format" option.
Method 5:
If Method 4 does not work or fix the damaged drive, let me know. You may need an advanced technique to fix it if the drive is physically not a problem.
OPTION:
Purchase a known good hard drive that conforms to your computer's ATA specification. Fix the damaged hard drive some other time. Nowadays, prices of hard drives are inexpensive.
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