Just in case someone want to know what's the deal with the problem I mentione about the denoiser feature, I thing I have figured it out.
For some strange reason the default values on Exposure and Saturation is set to -1 and what ever I do, the setting always jumps back to this numbers.
I had to chose "Save to Recend Renders" or "Save To Scene Settings" to get rid of the black image after the post processing.
The handling is quite differend in comparison to Poser 12, in which I just enabled the PostFX and the magic happend.
But since I figured out how it work's, it does a beautiful job. Now we can actually speak of enhancing the raw image inside Poser.
I like it so far.
BTW, no crashes since installing it. I'm running version 13.0.287 right now.