English is not my native language, too, but French would be even worse!
Ich würde auch lieber auf Deutsch antworten, aber das verstehen hier auch nur wenige...
So we stick to English! (I guess, you know how to use online-translators?)
As I wrote in the first few words in first answer:
plc-user wrote:It is not QElectroTech that is the problem,...
To be neutral:
It's the Operating-System!
The one you use, changes standard-fonts from version to version, from country to country, from...!
Install the same font you used on the other system and keep your fingers crossed, that this is the solution!
On the other hand, you can use a text-editor to change the font and font-size in the qet-file as the other user suggested in the thread I linked above.