A couple of thoughts...
Did you go for this version/upgrade for a specific reason? There's a 3.4.0.4 and a v4 available now?
Nothing I can see in the release notes suggests a specific fix, but it might be worth considering the newer ones?
Other than that, I'd think you'd want to be in front of the client to debug it, as the IAP debugging is a bit limited.
Other than that, perhaps try a reboot?