Only after the update will it not open-- there is no way in reversing my update without hacking the phone or whatever it is called.
If anyone could help I'd be very grateful.
I've also emailed ludei support but hoping for a quicker answer on here!
@Kyatric you're amazing.. perhaps you know the answer?
Turns out since I updated to ICS I simply needed to re-install the app! No more problems.