It's the current version of TurboActivate, we just started using it, dynamic. After further investigation this turned out to be a Visual Studio Exception setting. In the Debug / Exceptions dialog some users had all the "Break when an exception is: Thrown" entries checked. This apparently causes ALL exceptions, even ones that are handled inside a third-party DLL, to pop up in Visual Studio. There's no crash dump, you can't even catch the exception - because it's HANDLED INSIDE THE THIRD PARTY DLL! Why is it even possible to display these?