8. June 2007 10:52
In the hopes that I can save someone wasting quite as much time as I just have on this - Customer Debug Probes have changed name and become Managed Debug Assistants. (Google doesn't appear to have joined the dots on these two, so let's hope this helps).
They're exactly the same concept, but have had a bit of an overhaul, including a new name and naturally enough, a completely different way of enabling them. This MSDN page details how to enable and configure them (individually, and in an application.mda.config file).
These are debugger messages, so you have to be in a debugger to view them. One gotcha is that the application.mda.config file doesn't work when in Visual Studio. Instead, you need to go to the Debug menu -> Exceptions window and you can enable and disable the assistants there. In use, they interrupt your running as though an exception were thrown.
This has been a public service announcement on behalf of those struggling with COM interop.