iPhone App update to 2.0

I upgraded to version 2.0.0 on my phone and it simply wouldn't run. It got to the part about verifying your location then just quit. Luckily, it was backed up on my mac iTunes, so I deleted it from my phone and re-installed it.

I checked for another update but it looks like it's been pulled from the store

Yes, I had a simialr problem but solved it by removing the app and re-installing, then re-booting my iPhone. Once I did this I had to check my location services were working, just turned them off and on again.
This sorted it.
Looks like they've pulled the app from the store so they're obviously fixing it. Let's hope it's back up soon because once I got it working it's really very good :)