Why does my iMac screen seem to be flickering everytime I launch an app since Mavericks update?

Am I the only one who is having this flickering thing (for 1 sec) when an app is launched? This only started right after the Mavericks update, I don't know if it's iMac related or if everyone who updated to Mavericks got this.

Do you have any external drives attached that may have an older version of iTunes on them?
I wonder whether reinstalling (one more time) using the standalone installer rather than the App Store may help get round the problem:
http://support.apple.com/kb/DL1614

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