A month ago I solved my applcation freezing issues for Python 2.7 as you can see here. I have since adapted my code to python 3.5 (using Anaconda) and it appears to be worki
Uninstall Anaconda and everything works... I conclude that you simply cannot have Anaconda installed and use the standard Python 3.5 compiler at the same time if you're using Pyinstaller. Maybe this is related.
This is not the first time that uninstalling Anaconda appears to solve my issues... If I should report this issue somewhere please comment below. I don't know where.