Usually when I debug a SharePoint Web Part, if I have an unhandled Exception the Debugger breaks at the line where the Exception occurred. However, I have a Web Part, that my predecessor made, that goes directly to the OTB Runtime Error page. There is no error handling in the C# code. I looked at the debug options and everything looks right; all options of the form "Break when X" are turned on.
Is there some setting that causes the behavior that I am seeing?