Revit 2026 hangs at splash screen, journal consistently cuts off at IdSDK environment is commercial, affects all user profiles, network connectivity confirmed

[lugon2]

I recently started having problems opening Revit 2026 after downloading/installing the Land FX plugin and the Environment plugin. Revit gets hung up at the splash screen and never opens, when I check the journal it cuts off at IdSDK Environment is Commercial.

I've tried opening it with all the add-ins disabled, in admin mode, in another profile, flushed the DNS, and still nothing.

[jose_Miquelao]

1. First: Confirm Revit Itself Still Works Without Those Plugins

You mentioned “opening it with all the add‑ins disabled” — I’ll just confirm the strongest way to do that:

A. Rename the Addins folders (hard disable)

Close Revit completely, then:

1. Go to
   C:\ProgramData\Autodesk\Revit\Addins\2026
2. Go to
   C:\Users\<YourUser>\AppData\Roaming\Autodesk\Revit\Addins\2026

In each of those folders:

• Rename the folder 2026 to something like 2026_OFF or
• Move everything inside into a backup folder like Disabled_YYYYMMDD.

Now try to start Revit 2026.

• If Revit opens normally now:
  The core installation is fine; the issue is definitely in one or more add‑ins (very likely Land F/X / Environment).
• If Revit still doesn’t open:
  We likely have a deeper problem (corrupted config, licensing, or Revit install). In that case, we’ll treat it separately.

Since you already tried “add-ins disabled”, if you did it via a different method (like only changing .addin extensions), it’s still worth doing this folder rename approach once to be 100% sure.

---

2. Identify Which Plugin Actually Breaks Startup

Once you confirm Revit opens with add‑ins disabled:

A. Re‑enable add-ins one by one (or small batches)

1. Create a folder: C:\ProgramData\Autodesk\Revit\Addins\2026\_TEMP
2. Move add‑ins back in small groups:
   • Start with only Microsoft/Autodesk or other known-good add-ins.
   • Test Revit.
   • Then add Land F/X files back.
   • Test.
   • Then add Environment / IdSDK-related files back.
   • Test.

The moment Revit hangs on the splash screen again, you’ve found the problematic add‑in or combination.

B. Files to look for (typical names)

In the Addins folders, look for:

• LandFX.addin, LandFXRevit.addin, similar
• Anything with Environment, Enscape, IdSDK, or vendor name in:
  • .addin files
  • matching DLLs in the same folder

Once you identify the exact .addin that causes the hang:

• Remove that .addin file (or move to a disabled folder)
• Re-test Revit

If Revit then opens: the culprit is confirmed.

---

3. Clean Reinstall of the Problem Plugin(s)

Once you know whether it’s Land F/X, Environment, or some other IdSDK‑related component:

A. Uninstall via Windows

1. Open Apps & Features / Installed apps in Windows.
2. Uninstall:
   • Land F/X for Revit (if present)
   • Environment / Enscape / any IdSDK‑branded plugin you just identified
3. Check that their .addin files and folders are also gone from both Addins paths:
   • C:\ProgramData\Autodesk\Revit\Addins\2026
   • C:\Users\<YourUser>\AppData\Roaming\Autodesk\Revit\Addins\2026

If anything is left behind (DLLs, .addin files), move them out manually.

B. Repair Revit 2026 (if hangs persist after uninstall)

If Revit still fails to start even after uninstalling the plugin:

1. In Autodesk Access or Control Panel → Programs, choose Repair on Revit 2026.
2. After repair, start Revit with addins folders still empty.

If Revit now works reliably, reinstall plugins one by one, testing after each installation.

---

4. Special Thing About Land F/X + Environment Together

Those two may both:

• Hook into Revit’s startup
• Use similar rendering or geometry APIs
• Load their own licensing / SDK modules (IdSDK-like)

Possible issues:

• Version mismatch: Land F/X built for Revit 2024/2025 and not tested on 2026 yet.
• Environment / IdSDK version not compatible with Revit 2026 or with the version that Land F/X bundles.
• Both trying to load or patch the same DLL or host at startup.

Recommended here:

1. Check each plugin’s release notes / download page:
   • Explicit Revit 2026 support?
   • Any known issues with 2026?
2. Make sure you have the latest versions of both, specifically marked compatible with Revit 2026.
3. Try running with only one of them installed:
   • Revit + Land F/X only → test
   • Revit + Environment only → test

If Revit only hangs when both are installed together, it’s an interaction bug between the plugins. In that case:

• Gather:
  • The journal file where it stops at IdSDK Environment is Commercial
  • A list of installed versions (Revit, Land F/X, Environment)
• Send to both vendors’ support and ask if there’s a known conflict with Revit 2026.

---

5. Journal and Log Tips

You already looked at the journal; to maximize its usefulness:

• Use the latest journal from:
  C:\Users\<YourUser>\AppData\Local\Autodesk\Revit\Autodesk Revit 2026\Journals
• Check lines immediately before and after IdSDK Environment is Commercial, and see:
  • Is Revit starting to load a specific add-in right before that?
  • Any “exception” / “failed to load” messages?

These snippets are gold when sending to plugin support.

---

6. Nuclear Option (if nothing else works)

If after:

• Disabling/moving all addins
• Uninstalling the plugins
• Repairing Revit

it still hangs at the splash screen, then:

1. Rename the Revit 2026 user profile folder:
   • C:\Users\<YourUser>\AppData\Roaming\Autodesk\Revit\Autodesk Revit 2026
   • to something like Autodesk Revit 2026_OLD
2. Start Revit again. It will recreate a clean user profile/config.

If even that fails, a full uninstall Revit 2026 → remove leftover folders → reinstall might be needed, but only after you’re sure the add-ins are not still in the way.