If breakpoints suddenly freeze your QtCreator interface in debug mode, itâs likely a mismatch between your Qt version, debugger, or build settings. Make sure your project is built in Debug mode with debug symbols enabled (CONFIG += debug in .pro file or -DCMAKEBUILDTYPE=Debug for CMake). Try cleaning and rebuilding the project, and check the Debugger Log for sync issues. If nothing helps and the issue appeared after a system or tool update, updating Qt and your debugger might be necessary. Before doing that, back up your setup and confirm compatibility between Qt, GDB, and your compiler.