I build several desktop applications using PySide. It works like a charm on Windows. However, I found a nasty bug in the Mac version which I could not reproduce on my local machine. This one drove me nuts. It was hard to analyze, I own just one Mac and do not have access to another machine. Luckily, with the help of some very long googling (guessing symptoms) and the help of a user of one of my applications, I could fix the issue. As a reminder for myself and help for you, I document it.
I am currently writing an eBook Writer desktop app and i am using python 3 and PySide. It is the first time i am actually using QT and PySide. Some hings go really easy, some not so and sometimes i encounter strange behaviour. This article covers one of those.