Hi, consider this snippet: from PyQt5.Qt import * from PyQt5.Qsci import QsciScintilla
if __name__ == '__main__': app = QApplication([]) w = QsciScintilla() w.setText("hello world") w.show() app.exec_() *Test1) *Run it, press ctrl+c, close the window and then open your system clipboard viewer... for some reason on windows7 the is broken, you'll binary content --> this <https://dl.dropboxusercontent.com/s/gtf9cgg1cygbre4/clipbrd_2019-06-14_12-56-37.png> . That means you won't be able to paste the content on a text editor. *Test2) *Run it, press ctrl+c and then open your system clipboard viewer, in this case you'll be able to see the copied content correctly, like this <https://dl.dropboxusercontent.com/s/8xq5riznnxs07cg/clipbrd_2019-06-14_12-59-06.png> . This issue has really annoyed me in the past many times but I didn't know how to reproduce it or what was the reason why the content I'd copied from my app couldn't be pasted anymore *Requirements:* windows 7 ultimate Python 3.6.4 (v3.6.4:d48eceb, Dec 19 2017, 06:04:45) [MSC v.1900 32 bit (Intel)] on win32 QScintilla==2.11.2.dev1905151033 PyQt5==5.12.2 PyQt5-sip==4.19.17
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