Since I upgraded to Moutain Lion I'm dealing with wifi problems : no connection or random connection

Since I upgraded to Moutain Lion I'm dealing with wifi problems : no connection or random connection. With  OS X Lion wifi was OK.

So, Darrall, it seems to be fixed.  Mind you, this has happened through a seemingly unrelated, but hopefully replicable sequence of events.  You be the judge.
I went to my other login account, which as it happens is also an admin account.  Voila, the secondary click worked fine.  So I returned to my primary account, where I did the following:
First, I unpaired the trackpad.  then I remembered I needed something to move the mouse with, so I re-paired the magic mouse I'd had before.  I thought I'd turned off the trackpad, but apparently not, so the computer re-paired it automatically. None of this had any immediate effect, as you'd imagine.
Then I went to Mission Control in Preferences. There, I deselected "Show dashboard as a space", and in the hotcorners, I deselected Mission Control from the bottom left, where it had been. I didn't replace it.
Now, my secondary click works. Uh huh. I was suspicious that it might have more to do with Mission Control and/or Dashboard than the trackpad, only because I'd beaten that horse till my arm hurt and this was all I could think of. 
Never did I imagine this would get fixed short of creating a new login account and somehow copying everything - since I didn't know what was wrong, I could easily have copied the error too - so I'm very pleased and relieved.  If you haven't fixed yours yet, try this.  Let me know what happens!

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