We use twitter widgets quite much at www.thinglink.com, e.g. at http://www.thinglink.com/scene/406947675087306752
One thing we noticed happening lately is that twitter status widget often does not remove the pure HTML placeholder and everything starts looking ugly as on this screenshot https://www.dropbox.com/s/2nghoxnmxx1ppf1/twitter-status-placeholder-shown.png
Docs say that this HTML placeholder is supposed to be displayed only for non-JS enabled browsers, well, nowadays quite often it stays both in Firefox 22 for Mac and in Chrome 28 for Mac (something like in 20-50% of cases in our experience).
Interestingly sometimes placeholder is removed, but widget is displayed in a double size still and you can see the loading spinner there.
[14:41:13.153] TypeError: c.sandbox.win.getComputedStyle(…) is null @ https://platform.twitter.com/widgets.js:36
Or have anybody figured a workaround?