If either Select on Release or Scanning are set as an access method, Proloquo2Go will not scroll. To check these settings, tap the Options button in the bottom toolbar. Then, go to Access Method. Make sure that both Select on Release and Scanning are toggled to OFF.
If you see Page Up/Down buttons, these will also automatically disable scrolling. To remove Paging Buttons, go to Options > Interaction. Toggle Show Paging Buttons to OFF.
*On iPhone and iPod touch, you will find the Options button in the Tools popup at the far left of the bottom toolbar.