Hello Jerome,
thank you for your efforts !
I read the posts, i tried to change the export view - but nothing works !
It is still the same problem - Display only 20 Products, no possibility to switch to display all.
Also, when i select nothing - the csv file contains no products. 
And it does not help me if it works for you - for me it does not work !
I need this export feature urgently working, it is essential for price comparison sites.
Please fix this error, I would pay them even though it should be a basic function ! 
PS: i have also the same problem like Hubert - when i export 20 Products - the prices of the products
change with a comma error - 371.000 eur instead of 3,71 eur
see the file i attach
thanks