Using a physical switch - DL11 and USB1208FS

I have an application that runs in DL and links to a USB1208FS.  In the DL worksheet we have a switch (which pauses and restarts worksheet) and need to use a physical switch.  Originally connections made to pins 30, 21 and 40.  Problem was though that not enough voltage change being picked up for DL to recognise chage in state of switch.  So on the advice of a DL programmer - pin 30 was changed to pin 4 and pins 5 and 6 were joined - this worked fine.  Basically that is working analogue i believe.
Same app, different switch, same connections and now not working - worksheet permenantly in a paused state. 
any help gratefully received
Roger

Hi Roger,
Can you post the worksheet? 
What's the state of the input? Is it coming in high when the switch is open, and low when it's closed? That's what I saw on my training setup.
You may need to put a logic module after the switch to invert it ... or change the Trigger settings that you're using.
- cj
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