MBA 13" (Mid 2012) 10.8.2 does not see other Macs

Hello all,
for some time now I have a strange problem with my 13" MBA (Mid 2012 - latest version) on 10.8.2. THe MBA generally works very well, fast, and stable. My only issue is that I cannot see or connect to other Macs in my home WLAN network (this worked seamlessly under 10.8.1) or elsewhere. The other Macs do not show up in the finder, and neither can I connect with them manually (via "Go to server...").
The only way to establish a connection is via creating a computer to computer network - which works perfectly but, of course, disconnects me from the internet which comes over wifi, so this is not a permanent solution.
Even stranger, there seems to be a problem with ethernet connections (via thunderbolt ethernet adapter), too. This connection work seamlessly with one of my other Macs (running on Lion - 10.7), but does not work with my iMac running on Mountain Lion 10.8.2.
I guess that something's wrong with the sharing routines on my MBA. Therefore I tried to install the 10.8.2 combo update but had to learn that this was not made for the 2012 MBA... :-(
So, what to do? Should I try a reinstall of Mountain Lion?
Any help would be appreciated.
Thanks,
Jan

Hello medeostrike,
Thanks for using Apple Support Communities.
For more information on this, take a look at:
Intel-based Macs: Resetting the System Management Controller (SMC)
http://support.apple.com/kb/ht3964
Best of luck,
Mario

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