I have 3 computers: Winxpsp3 and win7-64bit.
On the win7-64bit I am now running Chrome 22.0.1229.92 and IE9 9.0.8112.16421. I have YouSendIt for Webmail 2.0 for Chrome and YouSendIt for Webmail for IE9.
On the WinXPsp3 machine I am running Chrome Version 24.0.1284.2 m and IE8 8.0.6001.18702. I have the same versions of the YouSendIt plugin\extension.

When I go into Gmail in IE or Chrome and press Compose, there is no YouSendIt button. It worked up until about 3 weeks ago. The extension is there and enabled. I have tried in an incognito window as well

I have re-installed/downgraded Chrome several times going as far back as May 2012 and as far forward as the latest version (above). I have not installed Windows Updates since August and will not be doing so until mid November (I do them quarterly).

YouSendIt claims it's not them and doesn't give a rats ass.... i'm shocked.

Anyone else seeing this? Any ideas? Did I break it?