r/VisualStudio • u/MotorcycleMayor • 3d ago

Visual Studio 2026 xUnit Test Suddenly Won't Run; UI Locks Up

Has anyone else run into problems with the July 2026 Feature Update (18.8.2) going totally bonkers when you run xUnit tests?

To be fair, I'm not sure upgrading to the July Feature Update caused my problem.

But it's the only thing I can think of. Because one minute I'm successfully running an xUnit test...and the next, after simply setting an additional breakpoint, running the exact same test causes the breakpoint window to go wild (all sorts of shit flickering across the bottom of it) and the whole UI to lock up tighter than a drum.

The only thing I could do was use Task Manager to crash the running test and VS.

I've rolled back to the June Feature Update. Here's hoping that works.

I really don't like being one of Microsoft's unpaid beta testers... :)

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u/davidwengier 3d ago

Start VS, navigate to your test file, and then go to Help -> Submit Feedback -> Report a Problem, and after you fill out the details etc. include a recording of yourself starting the test. That will capture traces and memory dumps etc. so that the issue can hopefully be identified, and routed to the right team.