As I stated in my origonal post the issue was when using standard DNN menu and 5.1.1 (I have left the 4.x era)

I tested som other too and the z-index (?)  problem was not visible however other "problems" showed up.

For example this nice skin http://skinsbyadammer.com/Greytness.aspx

makes the forum menu to render at random.

Maybe its a good idea to make some changes in the js for the forum menu.

OK, If I understand you right the core dnn nav menu and all other skin should adopt to the forum module.

Its a rather odd point of view. Is this the core team and corperation view too?

If so I 'll bee very suprised.

I don't think Matthias was referencing the core skin, and instead was referencing the third party skin you showed as a link. I am not sure what you are trying to accomplish here, but if your trying to simply notify me of a conflict I have taken note.

What I can say, there is likely many things w/ the default theme that people may come across as a conflict. I hope that they notify the team (like you have done) and make the changes they need. I am fairly certain that most people don't use the module in production w/ the core skins and thus I expect to get feedback about conflicts because I KNOW the module isn't going to be compatible with every skin out there. I have tested the module in various core skins, third party skins but may have not done things using the same configuration as others (for example, I never use the png javascript).  The responsibility of the team will be to take that feedback and take it into consideration in a future version (which I will do).