A new official version of Doom Builder 2 has been released, bringing it to version 2.1.0 (not to be confused with the previous version, which was 2.0.1). The highlights of this version include:
- Docked panels: Panels on the left or right side that can optionally hide automatically. Built-in panels provides mass undo/redo functionality and edit selection controls. Plugins can also add panels.
- Include system for Game Configurations. This greatly helps keeping the configurations clean and organized and makes maintenance easier.
- Checks for all sorts of limitations of the map formats. You can no longer place anything outside the valid editing area and you can no longer exceed the maximum number of map elements (which would corrupt your map when saving).
- Things no longer take up increasing amount of video memory, but use a constant amount of memory.
- Copy/paste object properties now also in classic modes.
- Improved sector triangulation (no more holes in textures in classic modes and sector floor/ceiling in visual mode)
- Improved DECORATE support.
- Improved TEXTURES support with distinct loading of 'walltextures', 'flats' and 'sprites'.
- Added support for tall patches.
- Zooming speed now customizable (see Preferences)
- Options to choose the buttons you want to see on the toolbar.
- A lolzillion fixes, changes, optimizations and smaller additions.
Note: due to internal changes some third party plugins may not work correctly anymore, please make sure to update them, too.
So what are you waitng for, hop over to the download page and get your copy!
If I add any sectors within a sector, the player is stuck at a certain height, and everything is invisible, if I add a vertex to certain linedefs, same thing happens 
anyhelp would be great 
(doo doo doo doo doo doo doo doo) 
