[wp-testers] Plugin Updater doesn't appear to work

[Steve Richardson]

Whenever I try to update plugins using the automatically update function,
the updater will start the download but then will freeze on that aspect of
it.

The following error is returned:

Line: 7
Char: 1
Error: Object doesn't support this property or method
Code: 0
URL:
http://www.blog.adequately-average.com/wp-admin/update.php?action=upgrade-pl
ugin&plugin=google-sitemap-generator%2Fsitemap.php&_wponce=5b6b959b8d

I'm running the latest nightly build, and using Internet Explorer 7