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Przeczytaj proszę czerwony baner z napisem "WAŻNE! Przeczytaj zanim poprosisz o pomoc". Potencjalnie masz problem z wersją pythona.

[..]Here you have the information by banner:[..] Thanks for the info - please read what chrisb wrote. Baners are not text search friendly and there is more info available. Regarding your issue - i tested it on my version and I get error message, but system doesn't crash and I can finish the operati...

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This tutorial? https://wiki.freecadweb.org/PartDesign_AdditiveLoft
Please post FreeCAD info as per the banner at the top of the page.

Can you mark the topic as [SOLVED]?

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[I'm not w windows person] Can you change tahoma to something else? Does it change the font?

@Karol Dembiński, it might be python version problem, please provide info as requested. OS: Fedora 31 (Workstation Edition) (GNOME/gnome-xorg) Word size of OS: 64-bit Word size of FreeCAD: 64-bit Version: 0.19.pre_20273 (Git) Build type: Unknown Python version: 3.7.6 Qt version: 5.13.2 Coin version:...

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Those are links in pdf file. You can switch the red boxes off in the options if your pdf viewer.

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https://peertube.social/videos/watch/d5 ... f83126e574

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Please use proper code formatting when posting code. I fixed this one for you.