SUMMARY This is about LivePreview. When the compilation is in progress, as soon as I type anything into the document, it aborts and kills the compilation. When it continues the compilation at some point, because of previous aborts, some aux files are broken, and then the PDF either fails to compile, or is partly incorrect. I guess the best way is to never continue a failed compilation, but to always start afresh. STEPS TO REPRODUCE I think it is relevant to have a big Latex project (such that compilation time is not instant, such that you have a chance to trigger this). I created this demo project: https://github.com/albertz/big-latex-demo Then trigger live preview compilation, then type sth, maybe switch tabs or so, such that it causes an abort of the live preview. Now undo your changes, and again trigger the live preview compilation. It will try to continue the previous compilation. And this can fail now, if aux files are incomplete/broken. OBSERVED RESULT EXPECTED RESULT SOFTWARE/OS VERSIONS Windows: macOS: Linux/KDE Plasma: Ubuntu 20.04 (available in About System) KDE Plasma Version: KDE Frameworks Version: Qt Version: ADDITIONAL INFORMATION