I am having the same issues and I tried you suggestion about exporting the sequence XML and bringing it into a new project with the other project closed and received the same errors – however I also received and XML Error Log as well and can post that information if you think it may help to figure this out.
Jason Watt
Producer
Parelli Natural Horsemanship
http://www.parelli.com
Parelli: A Natural Approach to Horse Training