Can't access ANY HTTPS sites, and problem affects only one user acct !

My new iMac (arrived yesterday) is driving me nuts, getting me sick. Countless problems ... def. not the experience I was hoping for ... (I'm not a new mac user, own a macbook for 3 years now).
The last one is that my account, for some unknown reason and all of a sudden (was perfect before), stopped working with ANY HTTPS connection ... banks, whatever ... anything that involves a secure protocol is out. I can't even login to my iTunes store. The message is that it can't estabilish a secure connection to the server. (Oh, the iTunes reports unknown error, wich took me 2 hours to find out that it wasn't iTunes fault, but the whole system was not working with HTTPS).
I already tried reparing the disk permission, verifying the disk (no errors found), AND reparing the keychain using the keychain aid. Oh, I also reseted Safari ...
The weirdest part of it all is that another account I had set up on the iMac works just fine. JUST FINE. And my main account is hopeless.
Does ANYONE have any clue on this ?
(btw my new iMac just screwed my iPhone on the first sync ... it was supposed to go smooth since it was set up using a time machine backup from the macbook .. but no, it erased half of my apps in the iphone, including my task managing apps with LOTS of scheduled to dos ... this is ridiculous).
Message was edited by: FelipeRaul

i have the same problem on an imac for a non-admin user. admin user is working fine. have installed 10.5.5 yesterday without any change. all patches applied. have also removed user and system keychain, because this was mentioned in a forum, did not help either.
please help

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