Changes in v0.73b (from the Changelog.txt):
. Model previewer now has the abiility to render the stage boundries as well as respawn and spawn areas
. Spawn areas turn red when they're too far away from the floor
. Added a "Zoom Extents" Button to the model previewer which will zoom the camera to the selected bone.
. BLOC archives are now rebuildable
.GSND files are now fully editable
. Collisions are now color coded by type.
. Floors = cyan
. Ceilings = red
. Walls = green
. No type = white
. Fallthrough platforms are rendered yellow.
. Ledge grab collisions have their appropriate link rendered purple.
. Update OpenTK library to latest stable release for optimizations
. Module names internalized (rather then pulled from external text file) and shown in properties as ModuleName
. BrawlBox icon replaced with 256x256 version

Known bugs:
. On my laptop (Windows 8.1) with its high-DPI display, viewing any model - whether in the model previewer or the bottom-right panel of the main window - causes the program window to shrink to 1:1 pixel size. This can be avoided by disabling DPI scaling in Properties > Compatibility for BrawlBox.exe.