I have a Python script and a C++ program running at the same time, both accessing the GPIO pins (not the same ones, though) in this order:

C++
Python
C++

The access of the C++ program worked (I used wireless transmitters and received the message). After that the Python access (light up an LED) worked as well. But when I tried to send another message using the wireless transmitters with C++, nothing happened, I don't receive messages anymore.
Is there a way to find out, whether the GPIO pins are blocked or something?
If you clean up the GPIO Headers in both scripts, it should be possible, otherwise it wont work.
You can clean up in python by using GPIO.cleanup(), then it sould work, cause it is clean again to your c++ Code.
Is it possible to access GPIO pins from a Python script and a C++ program at the same time?