same here. Have WP version 3.3.1, network enabled
Possibly a conflict with another plugin?
Plugins installed are:
Add Cloned Sites for WPMU (batch)
Akismet
Contest Burner
Crawlable Facebook Comments
Facebook Comments
Fast Secure Contact Form
fbLikeButton
Google News Sitemap Feed With Multisite Support
OptionTree
WordPress Importer
WordPress MU Domain Mapping
WP-Piwik
WP Native Dashboard
