PC Since latest hotfix, the game won't start.

Since 1.3.4's last update, the game hasn't been able to run. When i try to start it, an error message pops up asking me to start it fro my steam client. When I try that, the same thing happens. I have no idea what is happening.
 
I uninstalled Terraria, ran steam as an administrator and tried to run it. It is still getting the same error message a few seconds after it starts trying to run the program.
 
Follow the troubleshooting guide:

Troubleshooting Your Problem with TerrariaServer.exe
In order to figure out what your problem is with the game, we require that you run the Terraria Server Client (TerrariaServer.exe). This will display any errors or successes on launch. Should there be any errors from the program itself, use the command prompt and copy the error to display it here.
  1. Right click within the Command Prompt.
  2. In the drop-down menu, select Mark.
  3. Once you made a selection, Right Click or Press Enter to copy.
  4. Paste your results in your thread.
If you have trouble with the above instructions, your system might be showing "Not Responding" or your System may need to be rebooted to start clean.

Deleting the JSON files to clear Terraria Settings
Before proceeding any further, please delete the config.json file located in your Terraria Folder under My Documents/My Games. Then start Terraria again, this may fix some unexplained issues, but we wish to make sure you are running a nice and clean installation:
  1. Locate My Documents Folder.
  2. Open My Games Folder.
  3. Open Terraria Folder.
  4. Delete Config.json file from this location.
    • You can also delete the Favorites/Profile files as well, just in case.
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Installing / Re-Installing XNA and .NET Framework 4.5.2 or Better
You may be experiencing these issues with a faulty installation, and even worst your system might the be problem to this. Attempt to uninstall both XNA and .NET Framework from your machine, be advised, do not uninstall the pre-installed versions of .NET Framework that came with your system! Once you have successfully re-installed your XNA and .NET Framework you may attempt to try Terraria again.
Verify Terraria's Steam Cache
If your game is unresponsive at times it is recommended you do a Verify Steam Cache with the game provided for Steam (This does not include GOG Version).
  1. Goto My Library on Steam.
  2. Right-Click Terraria and Select Properties.
  3. Goto Local Files Tab.
  4. Now Select Verify Integrity of Game Cache.
If you have trouble with the above instructions, you may be using a different provider or retailer.
Frequently Asked Questions

Q: My world has corrupted somehow and will not load properly, what can I do?
A: You may have corrupted the world by using modded clients, computer shutdown before the world could complete the save, or system failure within Terraria that caused the problem. You can try attempting to load your world using TEdit (Download).

Q: My game is not launching, or I get errors regarding XNA/.NET Framework!
A: You can attempt to make sure you have all Game Dependencies first, then try attempting this solution:

If you don't feel like sifting through all that, it's basically to do with the framework permissions.

This is how you change the right to use Framework/XNA:
  1. Right-Click the specific directory (Listed Below).
  2. Select Properties.
  3. Select the Security Tab
  4. Click on Advanced Option
  5. Select the Owner Tab
  6. Click on the bottom button to Edit.
  7. On this window select the Administrator in the row and make sure to select the Checkboxes below.
  8. Hit Apply and close all the windows.
  9. Try running the game again.
Do the above for all of the following FOLDERS:

C:\Windows\Microsoft.NET\assembly\GAC_32:
Microsoft.Xna.Framework\v4.0_4.0.0.0__842cf8be1de50553
Microsoft.Xna.Framework.Game\v4.0_4.0.0.0__842cf8be1de50553
Microsoft.Xna.Framework.Graphics\v4.0_4.0.0.0__842cf8be1de50553
Microsoft.Xna.Framework.Xact\v4.0_4.0.0.0__842cf8be1de50553

C:\Windows\Microsoft.NET\assembly\GAC_MSIL:
Microsoft.Xna.Framework.Avatar\v4.0_4.0.0.0__842cf8be1de50553
Microsoft.Xna.Framework.GamerServices\v4.0_4.0.0.0__842cf8be1de50553
Microsoft.Xna.Framework.Input.Touch\v4.0_4.0.0.0__842cf8be1de50553
Microsoft.Xna.Framework.Net\v4.0_4.0.0.0__842cf8be1de50553
Microsoft.Xna.Framework.Storage\v4.0_4.0.0.0__842cf8be1de50553
Microsoft.Xna.Framework.Video\v4.0_4.0.0.0__842cf8be1de50553

Q: Steam has reported that one (1) file has failed verification and was downloaded?
A: This file is known as the serverconfig.txt file. Originally this file shouldn't be packed with the game as Terraria should create this file automatically on launch if it is missing or out of date. Due to it being changed and updated by server owners, the file will constantly fail the verification process. This has no effect on playing the game, and can be ignored.

Q: I am experiencing low frame rate for Terraria, but the machine passes as recommended?
A: If you are using nVidia Control Panel, you can select Terraria.exe process and change the specifications on how your graphic card handles the game. Follow these instructions:
  1. Open nVidia Control Panel.
  2. Select Manage 3D Settings.
  3. Choose Program Settings Tab.
  4. Select Terraria as current program.
  5. Turn Triple buffering and Vertical sync to On.
  6. Run Terraria and turn Frame Skip to Off.
  7. The application should be running better than your current setup.
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Alternate Solution (The Aero Mode Bug)
  1. Goto your Desktop.
  2. Right Click and Select Personalize.
  3. Enable Aero Mode by selecting an Aero Background Option.
  4. You can also go Fullscreen Mode while Disabled Aero Mode.
Q: Experiencing an XAudio Driver Issue?
A: Check this out about the error: http://forums.terraria.org/index.ph...out-due-to-xaudio2_6-dll-on-windows-10.32894/

Q: Missing XInput Driver for the game?
A: You can download Microsoft DirectX Web Installer and fix this issue properly. We do not recommend searching for the driver (DLL) manually. Download it here.

Q: Where can I find my world and player files?
A: You can find your world and character files based on your system here:
  • Windows: <home folder>\Documents\My Games\Terraria\Players
  • Mac: ~/Library/Application Support/Terraria/Players
  • Linux: ~/.local/share/Terraria/Players
However, if you're using Steam Cloud Sync, the files will be in a different location.
  • <Steam directory>/userdata/<Steam3 ID>/105600/remote/players
Q: Users with Windows 10 and Terraria Crashing (The Encryption Fix)
A: Apparently Terraria uses a specific encryption method, some OS types do not allow this like Windows 10. This can be fixed!


Terraria uses the RijndaelManaged class for player encryption, which isn't FIPS (Federal Information Processing Standard) compliant. There's a flag in the registry that tells Windows whether it should allow non-compliant encryption methods to be used. The registry key is:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa

If the value fipsalgorithmpolicy is present and set to 1, non-compliant algorithms will be blocked and will throw exceptions if you try to use them (like you got). Setting it to 0 should fix the error.

You might also want to check: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa\FipsAlgorithmPolicy

In case you don't understand the above text, I'll explain it by step:
  • Press the Windows Key (Button) and search for REGEDIT.
  • Browse to the location: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa
  • Locate the fipsalgorithmpolicy key and edit it by set its value to 0, or find the map with that name and disable it.
If done, I think the error wouldn't appear anymore.
 
@Tunnel King @Marcus101RR Thanks for the help, it's working again now. It started working after I installed Visual Studio 2015 in an effort to get the XNA framework download to work. Visual Studio installed the .NET version that I actually needed, so that worked out well. I didn't actually download the XNA framework because it still wouldn't work, but oh well.

Thanks again for the help!
 
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