Linedef and Sector Edit forms were saving default UDMF texture offsets (which led to increased map size).

TranslucentLine (208) action's "additive" property values were inverted.

Some more tweaks in ZDoom_misc.cfg

Added several UDMF properties to ZDoom configuration.

UDMF: UDMF texture offsets can now be edited in Sector and Linedef edit forms.
Floor and ceiling textures are now dragged properly in GZDoom Visual mode.

Floor and ceiling textures are now moved more predictably by arrow keys in GZDoom Visual mode.
Walls texture coordinates are always rounded when moved by arrow keys in Visual modes.
Linedef info panel: relative UDMF light values are now shown like this: 16 (128), which means "UDMF light value" ("total surface brightness (UDMF light value + sector brightness)")
Player is now spawned at camera height when testing from current location in Visual modes.
Focus is now properly restored after testing from current location in Visual modes.
Updated Heretic_sectors.cfg and Heretic_things.cfg as described here: http://www.doombuilder.com/forums/viewtopic.php?f=11&t=357
Changed sprites of artifacts in Hexen_things.cfg to proper ones.
Renamed Skulltag configs to Zandronum

Visual modes: selected objects are not highlighted when "Toggle highlight" (H key) option is set to off. 
Error Checks Mode: added linedef index to message text of all linedef-related errors.
UDMF: wall texture offsets are now rounded when user edits them via cursor keys or mouse dragging (because they are stored as integers anyway).

UDMF light editing in GZDoom Visual mode: sector brightness is changed instead of "lightceiling" property if targeted ceiling is part of 3D-floor.
UDMF Controls: increased precision of position and scale controls numeric inputs to 2 decimal places.
Sector/Linedef info panels: in some cases incorrect default values were shown for scale.
Sector/Linedef info panels: numbers are formatted more properly.

UDMF: changing brightness of a wall or ceiling in GZDoom Visual mode will change brightness of selected surface, not sector brightness.
Sector and Sidedef info panels show additional info if a map is in UDMF format.
Fixed: GZDoom menu panel wasn't updated when a map was opened via "recent files" item click.

Event lines for "event activators" (ActorMover, Camera and things with Thing_SetGoal special) are now drawn with different color.
Fixed a crash when a Thing with arguments is pasted in Visual modes.
Several other small fixes.
Fixed config error in ZDoom_things.cfg.
Fixed config error in ZDoom_ACS.cfg

Added toolbar button to toggle event lines on and off.

Order, in which patrol points and interpolation points are connected can now be shown in Things and Visual modes.

Lower and Upper portal icons were swapped.

Now only the root node of Folder/PK3/PK7 resource is expanded in Textures browser.

Actions and Effects can now be filtered (useful when you remember action/effect name, but don't remember it's number or category)

Fixed severe lags during Texture Browser opening when resource wad for current texture had lots of textures.
Texture groups weren't created properly in soma cases.
Added Monster/Hate Target sprite.

Updated to Doom Builder 2 r1604:
Stuck thing error checker now also regards thing flags. 

Color Picker plugin: color can now be displayed as HEX or Float.  

Relative mode is set to false by default.
Limits of Brightness slider were set after setting it's value, so values greater than 100 were set to 100.
Fixed a bug when a plugin tried to access 3d-floor-specific stuff of walls, which weren't part of 3d-floor.

Color Picker plugin: added float representation of current color (like 1.0 0.54 0.29). Should make editing of GLDEFS light definitions easier.

Find and Replace Mode: can now find things and linedefs by their flags

Fixed: inability to change 3d-floor height when control sector is too far away (further than current View distance).
Fixed: "Frame" property wasn't red by MODELDEF parser.
Fixed: PK3 archives are no longer locked when GZDB is running, so you can change their contents without closing the editor.

TEXTURES patches can now be loaded from anywhere inside resource.
Configs: things from "Cameras and Interpolation" and "Boom Items" categories weren't rendered in Visual modes.
Configs: several new icons are now used for things.
Reverted sectors rendering from 1.12b, because it was done in too hackish way and was causing more and more problems. Models rendered height is now 25% lower instead.
Models rendering height can be toggled between normal and 85% in Preferences->Appearance->"Scale models in Visual modes"
Fixed several small bugs here and there.

Things can now be rotated in visual mode.
Added JPG and TGA image format support.
Fixed: TEXTURES files with names other than "textures.ext" will now be loaded (as an example, files named like "textures.something.txt" or "textures_walls.ccp" will be loaded by (G)ZDoom, but not by Doom Builder 2 or previous versions of GZDB).
Fixed: textures defined in TEXTURES have higher priority in (G)ZDoom than images with the same name in "textures" folder.
Fixed another possible crash when MODELDEF is reloaded.

AngleOffset, PitchOffset and RollOffset MODELDEF properties are now supported.
Fixed a crash when editor tries to display a model for an actor without a valid sprite in Visual mode.
Fixed a possible crash when MODELDEF is reloaded from 2d-mode.
Fixed several things in Doom2_things.cfg.
UDMF Controls plugin:
Fixed several bugs in plugin's sliders logic.

Set PlatformTarget of ColorPicker, UDMFControls, TagExplorer and VisplaneExplorer to x86 (this should make Siberian_Tiger's work a little bit easier, I suppose...)
VisplaneExplorer: fixed a crash when user tries to enable Visplane Explorer mode in a map created via New Map command.

GZDoom Builder now uses SharpCompress.dll instead of SharpZip.dll.
Added PK7 archive support.
PK3 archives now load aprox. 40% faster.
Textures browser now shows Folder/PK3/PK7 folder structure.
TextureBrowserForm is now used to display both Textures and Flats.
ACS scripts from #include and #import directives are now shown in Script name/number dropdowns.
Fixed several cases when ACS scripts lists used in Edit Thing and Edit Linedef forms wasn't updated when they should've (i.e. after compiling a script).

Fixed another potential Decorate parser error while parsing one line actors.
Added info about GZDoom Builder to About form.