I found where these sorts of reports should go (the Visual Studio and .NET Framework dashboard; you choose "Visual Studio 2010, .NET Framework 4, and Silverlight Bug Form" and then choose "Windows Phone Developer Tools" as the "Visual Studio/Silverlight/Tooling
version" in the bug report form).
So I created a Connect issue for it, which can be found here: https://connect.microsoft.com/VisualStudio/feedback/details/632284/windows-phone-7-textbox-text-deletion-causes-an-internal-unhandled-exception-in-certain-instances . When you have a chance, please vote it up.
So I created a Connect issue for it, which can be found here: https://connect.microsoft.com/VisualStudio/feedback/details/632284/windows-phone-7-textbox-text-deletion-causes-an-internal-unhandled-exception-in-certain-instances . When you have a chance, please vote it up.