I have the following mcmod.info file in my mod:

 

[
{
  "modid": "DLDungeonJBG",
  "name": "Doomlike Dungeons",
  "description": "Algorithmically generates multiroom dungeons resembling Doom levels into the world.",
  "version": "1.7.5",
  "mcversion": "1.7.10",
  "url": "http://www.minecraftforum.net/topic/2382396-152164172-doomlike-dungeons-124-sspsmp/",
  "updateUrl": "",
  "authors": ["Jared Blackburn (JaredBGreat)"],
  "credits": "Andrew J. Apted for creating the Oblige Level Maker which inspired this.",
  "logoFile": "DLDLogo2.png",
  "screenshots": [],
  "dependencies": []
}
]

 

Which is far as I can tell is the correct format.  And it seems to be in the right place, as I'd expect with the new build system:

 

 

But for some reason it doesn't show up with the mods list; instead it says there is no information and to ask you mod author to supply an mcmod.info file?!  At first I was mildly concerned, then just stopped thinking about it.  But today someone actually asked on Minecraft Forums (http://www.minecraftforum.net/forums/mapping-and-modding/minecraft-mods/1293843-doomlike-dungeons-1-7-5?comment=391) for an mcmod.info file.  All I could say is that it was there.

 

Anyone know why this might be happening?  Does it require certain character encoding (my text editor defaults to UTF-8.  Or does it require Windows style line feeds to work?  I have Linux so the linefeed is different.  I really don't know why this is happening.  Anyone have any suggesting as to how to fix it?

Is the mcmod.info in your assets folder of your mod? If not, try it there when compiled. I'm honestly not sure what could be happening and I do remember hearing about problems concerning it.

I am p sure your mod ID has to be all lower case for mcmod.info to work , Otherwise your file looks same as mine ,I put tye mcmod even with my main package for my code and it works fine.