Hello,

In a couple of weeks we will be pushing live a new set of changes for the yahoo application platform. Many bug fixes and speed improvements are part of this release. (release notes to follow when we push the changes live)

Meanwhile, If you want to test your application on that new code base you can do so in our new sandbox! we encourage you to test your app by going to :
http://preview.apps.yahoo.com

To specifically test your app add your appID at the end:
http://preview.apps.yahoo.com/-APP_ID (or http://preview.apps.yahoo.com/-Qzxx7938/ for example)

If you want to get the developer preview with debug messages try this: (you will see all the caja debug messages, very helpful in case your app is not loading):
http://preview.apps.yahoo.com/dev-preview/.../YahooFullView/ -> note you need to be the application's developer to do this

Should you have any feedback please don't hesitate to do so through these message boards, we look forward seeing what cool apps you write!

Enjoy!

X
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Xavier Legros
Director Product - Yahoo! Application Platform