Reply to Deck 2/4 not responding

All of a sudden (of course) deck 2/4 jogwheel and cue function don't. Press play arcade button and nothing happens. Tried reloading mapping, no joy. Noticed on the instructions that come with mapping that under Device Set up, regarding Ports, it should read VCI, however it always changes to Generic Keyboard and In Port reads Generic Keyboard and the Out Port is greyed out N/A. Stuck badly, been hours trying to solve this. Any suggestions would be appreciated.