When you go to Edit>preferences tehn select the units tab. If you select English it does not save that preference to when you open it again. You have to select it every time you use the software.
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I can't reproduce the problem in the current version, it works fine for me. That's why I close this bug.
Probably ST is not able to save it because of write access problems? You should start the application on command line, then you can see more details.