Any problems with 3.4.2?

I just upgraded multisite to 3.4.2 and we are seeing an issue with rewrite rules and not sure if this has anything to do with the plugin. Basically the sites will run and get intermittent 500s. We are using SQL We are getting the following error written to the php log:
[18-Dec-2012 21:31:05 UTC] WordPress database error [Microsoft][SQL Server Native Client 10.0][SQL Server]Violation of UNIQUE KEY constraint 'sh_13_options_option_name'. Cannot insert duplicate key in object 'dbo.sh_13_options'. for query INSERT INTO sh_13_options (option_name, option_value, autoload) VALUES ( N'rewrite_rules', N'a:75:{s:19:"sitemap_index\.xml$";s:19:"index.php?sitemap=1";s:31:"([^/]+?)-sitemap([0-9]+)?\.xml$";s:51:"index.php?sitemap=$matches[1]&sitemap_n=$matches[2]";s:47:"category/(.+?)/feed/(feed|rdf|rss|rss2|atom)/?$";s:52:"index.php?category_name=$matches[1]&feed=$matches[2]";s:42:"category/(.+?)/(feed|rdf|rss|rss2|atom)/?$";s:52:"index.php?category_name=$matches[1]&feed=$matches[2]";s:35:"category/(.+?)/page/?([0-9]{1,})/?$";s:53:"index.php?category_name=$matches[1]&paged=$matches[2]";s:17:"category/(.+?)/?$";s:35:"index.php?category_name=$matches[1]";, wp, WP->main, WP->parse_request, WP_Rewrite->wp_rewrite_rules, update_option, add_option, sqlsrv_wpdb->query, sqlsrv_wpdb->_post_query, sqlsrv_wpdb->print_error

We have another instance of multisite running on the same box without this plugin and are not getting these errors.

Thanks for looking.

http://wordpress.org/extend/plugins/wordpress-mu-domain-mapping/