‘An error occurred when configuring keychain syncing’ shows up on my iMac after login in the morning, and today after being away for a few days. There are no noticeable problems using the computer and clicking OK removes the message until the next morning, annoying, but not fatal.
This error occurred after upgrading to Lion when it came out. Doing a manual sync via System Preferences does not reproduce this error and everything works fine. I used Keychain First Aid to examine the keychains, but there were no problems either. I found one post indicating that Apple is aware of this problem but there is no ETA for a solution.
After trying all of the suggested solutions Google served up, none of which resolving the problem, I will sit tight and wait to see if Apple will come up with a fix.
If any of you have a solution, please share and I will gladly try it.