Assuming everything goes smoothly over the next week I will be releasing Universe Sandbox 2.1 and making an additional announcement next Friday, April 29.
Version 2.1- Improved multi-core support
- Improved Save - dust, trails, and rotation will all be restored on load
- Will be a free upgrade for both free and premium users of version 2
- Requires .NET 4 (the current version checks for this and will ask you to upgrade)