We've not been able to reproduce this on our end with some sample data on VS2008 with Q2 SP1 (see attached video), so we suspect that this might be related to the exact business object you're using. We would appreciate if you send it or if you're not allowed to, prepare a BO that causes the issue and send it instead. Once we review it, we would be able to provide you with more info.
Also as a test, you can try the same steps on a different machine and see if it would cause the crash there as well. This way we would exclude the possibility of this being a local issue (corrupted Reporting, Visual Studio etc.).
the Telerik team