Help with setting Lame path

[most]

I have installed Mediacoder and trying to encode a movie with Lame Mp3 codec, but it doesn't work.
If I look at settings for Lame, I see that Path is empty and if try to set to the lame.exe, nothing happens. It won't remeber the path.

Would could be wrong? Is the path the problem or could it be something else?
Using version 0.5.1 b2456 and I installed Mediacoder to C:\Program Files\Multimedia\Mediacoder.