The first cumulative update for SP1 is now released. This must be applied on top of a SP1 installation. It fixes the following issues:
- Extending a large-volume class hangs the console indefinitely
- Adding 25th child item on a list results in an error
- DW data loss for relationship fact tables with properties
You can download it from here:
Additional detail and installation instructions:
There is also an Authoring Tool management pack library update with this so make sure you update the management packs in your library wherever you have the authoring tool installed.