Why I cant scan the the Whatsapp QR code? I have tryed to scan the QR code using whatsapp for web, also I see the: ok, I got it, then a green line start to scan but noting happened, I just downloaded the app yesterday night and also Im in the right position of the phone and monitor.  

Please can you help me? I have a: Samsung Galaxy Pro B7510.

Thanks a lot!
Personally I noticed that if I move the device further back from the screen it seems to help.Try moving it a bit from the screen.