Yamaha DTXpress/DTXplorer/DTXtreme

My first problems with my DTXpress 2. This morning all of a sudden 
when I was selecting a new snaredrum in the voice menu my hihat 
controler stopped keeping the hihat 'closed'. I can only pay with 
open hihat now. 'Chick' sound and footsplashes are still possible and 
give no problems. Is there a setting I might have accidentaly 
altered? Or could it be that a lead of my stereocable broke or 
something?

I hope you can help me otherwise I'll be going to the store and total 
nitwit-salespeople will have to help me :-(

Regards,

Joep