errors on tag page and category list

Using WPMS 3.2.1, Post Indexer 2.1, and Global Site Tags 2.1.1.

After installing these, I created several posts in the main and other sites, with both a category and tag assigned. I am getting errors on both the tag page and category list, and none of the posts are being displayed.

On the category page (e.g. /blog/categry/uncategorized/), I get the following error:
Notice: Trying to get property of non-object in /blah//wp-content/plugins/global-site-tags/global-site-tags.php on line 446

For whatever reason the $post global is null.

On the tags page (e.g. /tags/), I get the following errors:
Notice: Undefined offset: 3 in /blah/wp-content/plugins/global-site-tags/global-site-tags.php on line 281
Notice: Undefined offset: 2 in /blah/wp-content/plugins/global-site-tags/global-site-tags.php on line 281
Notice: Undefined offset: 1 in /blah/wp-content/plugins/global-site-tags/global-site-tags.php on line 281
Notice: Undefined variable: tag in /blah/wp-content/plugins/global-site-tags/global-site-tags.php on line 304

The tag widget renders just fine.

Aaron