It's crashing a few seconds after startup for me with this error info
Problem signature:
Problem Event Name: APPCRASH
Application Name: dota2cfg.exe
Application Version: 0.0.0.0
Application Timestamp: 53e24903
Fault Module Name: tier0.dll
Fault Module Version: 0.0.0.0
Fault Module Timestamp: 53dd4827
Exception Code: c0000005
Exception Offset: 00000000000163d6
OS Version: 6.1.7601.2.1.0.256.1
Locale ID: 1033
Additional Information 1: dda4
Additional Information 2: dda428afbc11375bf8e90b06b712d8ea
Additional Information 3: 7493
Additional Information 4: 7493f9096ce2d10c8d406a5372590675

I can't actually open the tools. I'm in the steam beta. I have enabled the workshop tools in the Dota dlc area, and I've downloaded the Dota 2 Workshop Tools Alpha.
Upon trying to open the tools steam flashes momentarily and nothing occurs. If I attempt to open it via dota2cfg.exe the explorer window flashes briefly, and nothing happens.

Here's my specs,
Intel Core i7-4770K 3.5GHz Quad-Core
Asus Sabertooth Z87 ATX LGA1150
Corsair Vengeance 8GB (2 x 4GB) DDR3-1600
Samsung 840 Pro Series 128GB 2.5" SSD
Western Digital Caviar Black 2TB 3.5" 7200RPM
EVGA GeForce GTX 780 3GB
Microsoft Windows 8.1 - 64-bit (OEM) (64-bit)

Heres my steam console,
Failed to init SteamVR because it isn't installed
ExecCommandLine: ""C:\Program Files (x86)\Steam\Steam.exe" -console"
System startup time: 4.25 seconds
CAPIJobRequestUserStats - Server response failed 2
Successfully merged depot script C:\Program Files (x86)\Steam\SteamApps\common\dota 2 beta\_CommonRedist\vcredist\2010\installscript.vdf
Game update: AppID 316570 "Dota 2 Workshop Tools Alpha", ProcID 2696, IP 0.0.0.0:0
Game removed: AppID 316570 "Dota 2 Workshop Tools Alpha", ProcID 2696
Successfully merged depot script C:\Program Files (x86)\Steam\SteamApps\common\dota 2 beta\_CommonRedist\vcredist\2010\installscript.vdf
Game update: AppID 316570 "Dota 2 Workshop Tools Alpha", ProcID 3520, IP 0.0.0.0:0
Game removed: AppID 316570 "Dota 2 Workshop Tools Alpha", ProcID 3520

Sadly out of the #dota2mods IRC I'm the only one with this problem.

EDIT: I didn't have many file on my PC so I just tried to format, and it's now working.

Hammer editor crashes when I click new file (I see the buttons getting enabled, but after 1 second it crashes). Dota also closes when that happens.

Specs:
Windows 7 Home Premium 64 bit (German)
8 GB Ram
Asus 6970 DCII (DX11 compatible)
AMD Phenom 2 X6 1090T

My VConsole2 output:

[ W HelpSystem ]: Failed to find help file 'tools/help/hammer_embedded_properties_help.txt' for context 'HammerEmbeddedProperties - new help will be written to 'd:\program files (x86)\steam\steamapps\common\dota 2 beta\dota_ugc\game\core\tools\help\hammer_embedded_properties_help.txt'
[ W InputBindSystem ]: Attempting to register the command MoveCameraForward3D for context Camera multiple times
[ W InputBindSystem ]: Attempting to register the command MoveCameraLeft3D for context Camera multiple times
[ W InputBindSystem ]: Attempting to register the command MoveCameraBackward3D for context Camera multiple times
[ W InputBindSystem ]: Attempting to register the command MoveCameraRight3D for context Camera multiple times
[ W InputBindSystem ]: Attempting to register the command MoveCameraUp3D for context Camera multiple times
[ W InputBindSystem ]: Attempting to register the command MoveCameraDown3D for context Camera multiple times
[ W InputBindSystem ]: Attempting to register the command MouseControlCamera2D for context Camera multiple times
[ W InputBindSystem ]: Attempting to register the command MouseControlCamera3D for context Camera multiple times
[ W InputBindSystem ]: Attempting to register the command MouseControlCamera3D_Toggle for context Camera multiple times
[ W InputBindSystem ]: Attempting to register the command HorizontalStrafeCamera for context Camera multiple times
[ W InputBindSystem ]: Attempting to register the command VerticalStrafeCamera for context Camera multiple times
[ W InputBindSystem ]: Attempting to register the command ZoomCameraIn for context Camera multiple times
[ W InputBindSystem ]: Attempting to register the command ZoomCameraOut for context Camera multiple times
[ W InputBindSystem ]: Attempting to register the command ZoomAllCamerasIn for context Camera multiple times
[ W InputBindSystem ]: Attempting to register the command ZoomAllCamerasOut for context Camera multiple times
[ W InputBindSystem ]: Attempting to register the command ToggleLockCameraHeight for context Camera multiple times
[ W InputBindSystem ]: Attempting to register the command ZoomForwardBack2D for context Camera multiple times
[ W InputBindSystem ]: Attempting to register the command ZoomForwardBack3D for context Camera multiple times
[ W InputBindSystem ]: Attempting to register the command PlanarStrafe3D for context Camera multiple times
[ W InputBindSystem ]: Attempting to register the command RotateAboutTarget3D for context Camera multiple times
[ W InputBindSystem ]: Attempting to register the command MouseLook3D for context Camera multiple times
[ W InputBindSystem ]: Attempting to register the command SnapCameraToSelection for context Camera multiple times
[ W InputBindSystem ]: Attempting to register the command MouseControlCamera2D for context Camera multiple times
[ W InputBindSystem ]: Attempting to register the command ToggleLights for context LightingControl multiple times
[ W InputBindSystem ]: Attempting to register the command RotateLights for context LightingControl multiple times
[ W SceneSystem ]: CSceneSystem::DrawMeshInstances(2518): Material materials/dev/reflectivity_30.vmat cannot render in mode <unknown> but is being asked to
[ ]: Disconnected From 'Localhost:29000'
[ ]: Connecting To 'Localhost:29000'
[ ]: Connected To 'Localhost:29000'

Everything closes, once i load anything in hammer.

Radeon HD 6670
Windows 8.1 64 bit
AMD Phenom II X4 965 3.40 GHz
4 GB RAM

Is running that Dota 2 Retail client required during development with the workshop tools? Is there a way I can disable that window via the launch commandline arguments?

Hammer crashes when I try to make a new file.

Specs:
Windows 7 64-bit
nVIDIA GeForce GTS 450
AMD Phenom II X4 955 3.2 GHz
4 GB Ram

Not sure if this is due to the legacy nature of my map, but near the outer edges, FoW calculations cease to work. I think the unorthodox[puu.sh] nature of my map may also contribute to the reason FoW doesn't work on the outer edges of the map (since it has voids between parts of the map, as well as no outer "wall" to base a limitation off of).

The Workshop Tools crash with "dota2.exe has stopped working" as it launches an addon in the editor.

Specs:
Windows 8.1 Pro 64-bit
nVIDIA GeForce GTX 570
AMD FX-6300 3.5Ghz
8 GB of 1600MHz RAM

The TakeDamage function deals all damage as pure damage. The damage_type value in the table does not seem to do anything (but needs to be valid).

Specs:
Windows 7 64-bit
AMD Radeon HD 7850 with Catalyst 14.4
Intel i5-2500K
8 GB of RAM

Not sure if a bug but there isn't an option to place a shop when trying to place an object using the tile editor, only neutral camps, banners, overlays

Hammer will crash a few seconds after trying to load a map or create a new one.

I have a 64 bit os, i have a gfx card supporting d3d 11, i have the latest c++ runtimes, i reinstalled the toolset, i verified the integrity of dota and the tools, i updated my graphics drivers, i reset my computer multiple times, i updated steam, no change.

Windows 7 Enterprise - SP1
Nvidia 560GTX - TI
AMD Phenom II X4 970
8GB of RAM

Missing executable? How can I fix this?

Everything closes (Hammer, the Asset Browser, and the game) when I try to create a new file, or open an existing one in Hammer.

Specs:

Windows 8.1 w/ Update 1 Pro 64-bit
AMD Radeon HD5850
AMD Phenom II X2 555 (3.2 Ghz)
8GB RAM

Hammer crashes when creating or loading a map / prefab.

Windows 8 64 bit
AMD HD6950
AMD Phenom 2 X6 1090T

Seems to be happening for quite a few people with an AMD cpu.

Not starting.
I enabled workshop tools in the dota-dlc area. I started the download from the tools page.
When I try to start "Dota 2 Workshop Tools Alpha" I get the following error:

Failed to start game (missing executable).

I allready tried verifying the local files of the workshop tools and dota 2. Didn't help.
I'm on windows 7 professional, service pack 1, 64-Bit.


On a (maybe) unrelated note: dota 2 now has a 0/0 Bytes missing update that never finishes, since the workshop tools alpha has been released.