Hello miss modular ...
Well, no one else is jumping in ... i thought I'd wait and see if any keychain expert could help you out ...
I don't know if this will help ... but seeing as you just updated ... I'll send you my generic troubleshooting file to deal with problems after an update.
Don't be afraid to do these ... they will not harm your system in any way ..
After these ... you can go on to the keychain links I will leave ..
Problems After Update?
Repair Disk and Permissions
These steps will check for, and usually repair, any corruption on your OS X boot volume
1. Boot from your Mac OS X Install Disc 1 CD or DVD. Put disc in drive, wait for it to show up on the desktop, then go to upper left of screen under the Apple menu and choose restart. Immediately hold the "c" key down until you see the apple logo.
If you can't get to your login screen insert the install disc in the drive and do an emergency shutdown as described in your computers manual. Then restart and immediately hold down the "c" key until you see the apple logo.
2. When the Installer window opens, select Installer > Disk Utility from the Apple® menu bar.
3. When the Disk Utility window opens, select "Macintosh HD" in the list on the left.
4. Select the First Aid tab on the right
5. Select the "Repair Disk" button on the lower right of the screen. If errors are returned repeat this process 2 or 3 times until they are gone.
If you still get errors then you will need to use a third-party disk utility to repair your Mac OS X boot volume, such as Alsoft® Disk Warrior®
http://www.alsoftinc.com/DiskWarrior/index.html
6. After Repair Disk completes .. click on "Repair Permissions" .. after this completes then go to Disk Utility > Quit. Focus returns to Installer.
7. Go to Installer > Quit. In the next menu choose Quit again and the computer will restart in OSX
8. Download and Run this ...Onyx
http://www.macupdate.com/info.php/id/11582
Go to Automation Pane ..
Check all the boxes EXCEPT
1. Optimize the system
2. Hidden DS Store Files
3. Links between documents and applications
Also choose "Clear All" in the button box for caches. Then execute
These settings perform three basic troubleshooting procedures ...
A) Repairs permissions
B) Runs Unix maintenance (cron) scripts
C) Clears caches
Before any system or security update ..
1. Disconnect all peripherals except keyboard and mouse ..
2. Make sure sleep and screensaver are disabled ....
3. Quit all other apps ..
Apple - Solving Problems with Keychain First Aid
http://docs.info.apple.com/article.html?artnum=152252
How to Create a New Keychain Default File
http://docs.info.apple.com/article.html?artnum=106973#one
Hope any of this helps ...