Rider 2024.2.3 - Loss of Functionality (Syntax Highlighting, References, etc.)

Happening many time times for me as well, in C++ with Unreal Engine in my case

I've found that invalidating the caches solves this (File → Invalidate Caches → check all → press Invalidate and Restart), but I have to do it every single time I open the program, which is a big pain in the ass.

Same issue (c# project), happened after the 2024.2 update. I have to start Rider, invalidate cache and restart then it works, but everytime I load a new solution the issue is back.

I am also having the same issue, and have raised a similar ticket which has not  received a response from JetBrains…

Hi everyone! 

I'm sorry you've faced such an issue. It is known as RIDER-116340 Code Parsing and Navigation Fails in Rider After Opening a Solution. We are working hard to fix it.
You can try the latest Rider Nightly build and check if that resolves the problem. If the issue persists, please follow these steps and let us know if they do not help. The issue is mostly about C#, but the workaround might as well help with C++ files. 
Thank you in advance, and have a great day!

Thank you Alexandra Guk! The Rider NIghtly build has worked for me (just once) but the thread you provided also helped and will keep me up to date on the state of the issue. Thanks again!

I have the same problem for C#. Restarting mostly works, but sometimes I need to restart again for it to work. I've had this problem for some time now.

It seems to have gotten much worse now, before an invalidate would solve it, but now it seems to only work sometimes and on certain projects.

Hi Everyone! 

This issue related to Rider 2024.2.3 and was fixed in 2024.2.5. If you still use an old version, please update to the latest one and check if it helps. 

If you have this problem with the latest version, please report it separately via Help | Report a bug with logs automatically attached and with as many details about the case as possible. 

Thank you for your understanding! 

I'm on 2024.3.5.  Half of my stuff does not highlight, mostly class names and decorators.  I've invalidated cache using all of the options and some of the options mutliple times.  Nothing helps.

JetBrains Rider 2024.3.5
Build #RD-243.24978.27, built on February 6, 2025
Runtime version: 21.0.5+8-b631.30 amd64 (JCEF 122.1.9)
VM: OpenJDK 64-Bit Server VM by JetBrains s.r.o.
Toolkit: sun.awt.windows.WToolkit
Windows 10.0
.NET Core v8.0.11 x64 (Server GC)
GC: G1 Young Generation, G1 Concurrent GC, G1 Old Generation
Memory: 8096M
Cores: 24
Registry:
 debugger.watches.in.variables=false
 ide.experimental.ui=true
 ide.mac.bigsur.window.with.tabs.enabled=false
 llm.show.ai.promotion.window.on.start=false
Non-Bundled Plugins:
 com.intellij.ideolog (243.23654.177)
 com.godwin.json.parser (1.8.2)
 net.seesharpsoft.intellij.plugins.csv (4.0.2)
 org.exbin.deltahex.intellij (0.2.10.1)
 com.microsoft.vso.idea (1.162.2)
 

RIDER-123138

I am using JetBrains Rider 2024.3.6 and am still experiencing this issue.  Invalidating cache does not resolve the problem.

Hi Graham King! 

Sorry to hear you've met such an issue. I've responded to your private request, please collect the requested troubleshooting information. 

Thanks! 

Even after upgrading to 2024.3.7 today, I also am experiencing this issue.

I have the very same problem since quite some time. Upgraded to 2024.3.7, same issue.

To those who encounter the issue recently, such issue usually requires additional time to be investigated thoroughly. To ensure it receives the necessary attention, I would suggest you raise a new issue in our issue tracker or create a support ticket, with Rider logs below:

• Go to Help | Diagnostic tools | Show Log in Explorer, then clear the existing logs.
• Restart Rider
• Go to Help | Diagnostic tools | Choose Trace Scenarios;
• Enable the trace scenario for SWEA, SWEADeepDependencyAnalysis, Daemon;
• Reproduce the issue;
• Collect the full log bundle via Help | Collect Logs and Diagnostic Data;
• Disable the trace scenarios enabled;

I had this issue for months and tried everything in this thread and other threads I found. Syntax highlighting was fine from the moment the editor opened, but a bunch of it was lost once all the projects finished loading a few seconds later. I finally found what was wrong in my case: the syntax highlighting depends on the code analysis being enabled. I can't even remember turning it off, it must have been months ago, I might have been looking to just remove the underline squiggles.

I finally found that going into Settings > Editor > Inspection Settings and enabling Enable code analysis resolved the issue for me.

 

I was able to fix this by going into Settings > Editor > Inspection Settings and then enabling Color identifiers under Highlighting.

This issue was fixed for me with the progression of this issue.