ReSharper features stop working in one solution

Problem

ReSharper features such as code analysis, code inspections, and navigation stop working in one solution. In other solutions, ReSharper works as expected.

Cause

A possible cause is corrupted ReSharper caches or a corrupted Visual Studio solution user options file (.suo) for this solution, which ReSharper cannot rebuild automatically.

Resolution

Clear the ReSharper caches for the solution:

1. Open the solution in Visual Studio.
2. Select ReSharper | Options from the main menu, or press Alt+R O.
3. Go to Environment | General.
4. Click Clear caches.

If the problem remains, delete the .suo file:

1. Close Visual Studio.
2. Delete the .suo file in <solution folder>\.vs\<SolutionName>\v<NN>\, where <NN> is the Visual Studio version number: v17 for Visual Studio 2022, v18 for Visual Studio 2026. The .vs folder is hidden. For Visual Studio 2013 and earlier, the file is <SolutionName>.suo next to the .sln file.
3. Open the solution again.

Delete the caches manually

Clear caches cleans only the cache location that is currently selected. To delete the caches manually, close Visual Studio and delete the cache folder for the solution. The cache location is selected on the Environment | General page. The folder to delete depends on the location:

• User local settings folder (default): %LOCALAPPDATA%\JetBrains\Transient\ReSharperPlatformVs<NN>\v<build>\SolutionCaches\_<SolutionName>.<number>
• System TEMP folder: the ReSharper cache folder under %TEMP%
• Solution folder: _ReSharper.Caches in the solution folder
• Custom folder: the solution folder inside the custom location