Why do I suddenly have to type my password twice at mountain lion login screen?

I am running 10.8.2 on my 2012 11" air 64GB / 4GB.
Suddenly I have to type my password in twice when logging in. It seems to accept it, then pauses, and I have to type in again, after which it logs in fine.
Interestingly this only happens with my main username. I have another user profile which has fewer apps and I wonder if there is some incompatibility.
It happens both when waking from sleep & from full restart.
I've reparied disk permissions using disk utility and onyx.
I'm not using firevault (it is off and I believe always has been).
I have no peripherals plugged in.
The password thing It's a minor inconvenience only but the system has been a bit unstable recently with a occasional sudden shutdowns. Also all my chrome "favicons" disappeared after the last crash. (the double password thing was happening before this). So I wonder if there is an underlying problem
Any ideas?

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Why do I suddenly have to type my password twice at mountain lion login screen?

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