On my new MacBook Pro running Snow Leopard 10.6.2 and Google Chrome for Mac, 5.0.307.11 beta, some (but not all) of the icons for extensions have disappeared. I can tell SOMETHING is still there, because the space is occupied and you can see it indent as you mouse over it. You can also see the name of the extension pop up in a balloon below.
But the extension icon is invisible and the extension itself doesn't work.
Right now it's happened with Google Translate, the show-in-IE extension, Wikipedia Chromium, Send with GMail and Clip to Evernote.
The LastPass and Feedly extension icons are still visible.
Any ideas on how to get them back and stop this from happening again?