Piwik 1.2 and IE9 RC -> empty dashboard #2124

The dashboard is empty browsing with IE9 RC.

A javascript error is thrown. Here is the details:

The object does not support the property or method:
f=a.getElementsByTagName("*")

at url (of the online demo):
index.php?module=Proxy&action=getJs&cb=22bde929b110610a2f7c45fcd1f8e423

Row 17, Column 59007

Please delete all files in tmp/assets to make sure all cached files are generated properly.

On my web server I just upgraded to 1.2 release, delete all files in tmp/assets, cleaned the browser cache, and finally I get the dashboard!

Anyway I get still the problem on the online demo, I suppose because tmp/assets are not being deleted in last days.

Thanks for your help

(In [4002]) fixes #2124, refs #660, refs #1950 - remove assets here too