I've been having the exact same issue on my new Brooks. It's funny that it feels fine when you are riding. I've done a 40 miler on it, and a number of 25 milers. Not to mention about 3-4 weeks of commuting. It feels fine when riding, but afterward my junk is numb. I was hoping it would go away until I read this thread.

Now I'm taking 2 weeks off. I didn't ride last weekend. I have only a partial week this week (which I'm not commuting) and then off to FL for a week starting Friday. That will give me about 2 solid weeks off the bike.

If I'm still having issues when I get back, I think I may have to drop the Brooks and go back to my old saddle or at least something similar. I like the little bit more width the B-17 has (about 170mm vs. 150mm) so I may look for a regular padded saddle with a wider width than the previous one.