I did find a solution, indeed - after checking for a while…
It seems that there is a debug code that is left over inside the SerialBot.cpp (check under C:\yourUser\documents\arduino\libraries\Allbot\src) -
On the update function which is called continuously - there is a send status call that is also called continuously ! This command sends the status of the arduino pins in a loop (forever) which fills the buffer of the Serial port within a few seconds or so…
You can check this by opening a Serial Monitor from the Arduino IDE and setting the speed to 115200 (the speed setup in the Vr408Scratch in the setup() )
Now - this was most probably a debug code - the idea is that we do not need it. and It DOES interfere with the robot controlling and therefore should be commented (as it is in the code above)…
I AM a bit disappointed by Velleman though for not properly solving this - I had to solve it all by myself !
I hope this helps,