My device is a Motorola Droid Razr M running Android 4.4.2. Feature was working properly with TP 188.8.131.526. After installing 184.108.40.2064 tapping a button assigned to scan (using device camera) sets focus on the button, but does not open the scan window. This was tested with previously built projects and a new project made with the updated TP Desktop, which consisted of one session with one field and one button set to scan. Setting the field's InputType property to 'Barcode' and entering the field does open the barcode scanning window and is able to read barcode data into the field.