Full conversion menu_bg.map is not visible/black screen, pixelated text & mouse lag?

[ExpectedIdentifier]

1) Make sure you start from the default menu map file and DO NOT delete the camera. Last time I tried to make a menu bg from scratch, the camera area I made was causing issues. If you made the menu level from scratch, try importing the level into a duplicate menu_bg.map from the original.
2) Delete any map_caches if there are any.

I'm sorry but what do you mean by "try importing the level into a duplicate menu_bg.map from the original."? Copy the menu_bg.map, place the original one else where and put he copied one in the main menu folder? If so I tried that and no luck and I was mistaken about the game loading properly, I forgot I was loading he custom story version through the original Amnesia. I keep getting a BlackBox error report while loading the first map, the loading screen is there as well as the music but after a couple seconds it crashes or if I click the screen.

1.) If you have a full conversion I'm assuming you have a custom menu.cfg file, if not ignore this step and go to 2. If you do, the name of the background map is specified in menu.cfg, make sure they're the same name (this probably isn't the issue, good to be sure though).

2.) It's probably this - Make sure the camera in your bg map is called CameraPos, if it is, maybe the camera is facing the wrong way (it's actually opposite to the direction it faces usually when you use it as a player start area).