Re-post: iMac with Mavericks loses internet connection (browsers only)

I posted this question a while ago. Noone answered. I'll try again since this is now becoming VERY annoying...
  I have a very strange issue. My 21.5" mid 2011 iMac with Mac OS X Mavericks 10.9 has, since upgrading to 10.9 (and now 10.9.1), started to lose its internet connection from time to time (once a day).
It has full access to the entire local network AND the VM Ware Fusion Windows XP running on the same machine has full internet access. I can use apps like Skype - but no browser. I have Safari, Firefox and Opera installed - they cannot access ANY web site what so ever. App Store does not work.
The only way to restore the connection is to reboot the computer.
- Re-starting the browsers does not help
- Changing from Ethernet to WiFi does not help
- Re-arranging the connections in Network Settings does not help
- Renewing DHCP does not help
- Setting the IP-address manually to something else does not help
- Deleting the network in Network Settings does not help
- Deleting the files "NetworkInterfaces.plist" and "preferences.plist" does not help
- It is not a sleep issue. Sleep mode is OFF
- It is not a DNS issue
- The Mac OS X Firewall is OFF
- The network settings for Max OS X and the virtual Win XP are identical except the local IP-address
Please, someone, HELP ME!!

Here I'm having the same trouble... Exactly the same!
It's not a DNS problem, nor connection. All other apps still has internet connection, I can ping any domain, etc. But Chrome, Safari and Firefox are completely offline. It's terrible, because I'm always working and then I need to reboot to have internet on browsers again...

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