I noticed yesterday that an enhanced version of the ADO.NET Connection Assistant feature of my MZ-Tools add-in causes an exception for OLEDB connection in VS 2010 RC, not in VS 2008 or 2005. After a couple of hours debugging and trying to figure out why, I finally noticed that VS 2010 RC also suffers that problem in its own Add Data Source dialog. Here it is the bug report:

Data Links button on Add Data Source dialog causes AccessViolationException

https://connect.microsoft.com/VisualStudio/feedback/details/534307/