It crashes in some random appdata folder because that’s how onefile works - it unpacks itself into a temporary folder before running. As for matplotlib - what versions of matplotlib and PyInstaller are you using? There have been a couple of fixes to PyInstaller in the last few months. matplotlib 3.3 requires PyInstaller 4.1 and matplotlib 3.4 requires 5568 <https://github.com/pyinstaller/pyinstaller/pull/5568> which hasn’t been released yet so you will have to install PyInstaller from Github.
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