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

[GoreGrinder99]

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.