I don't really want to bag on another logging framework, but I've come across many posts that are downright scary. Here's an example of a situation with one of the most popular logging frameworks. Read down a bit and you'll hear about deadlocks that happened every day--until they removed that logging framework.
I've also read about other serious deadlock issues with that framework. But posting more links would be just piling on.
Try this one for yourself (if you're masochistic enough to be using that other framework). Delete the log file while your application is running. Oops. You can't do that, can you? Because the file is locked. I sure hope you don't have another application writing to the same file--or another logger in the same application.
For me, I think I'll stick with a framework that doesn't require a Ph.D. to configure--and one that is thread-safe, and yet I can be sure won't put my application into any deadlock situations. Like this one.