There are a couple of related issues with multitouch and inneractive. When displaying banner ads multitouch is disabled below the ad, but not above. On full-screen ads, multi-touch does not work after skipping the ad.
Both of these issues seem to go away once you hide the ads, but that can involve some extensive workarounds and/or limited ad usage.
Check this thread for a ton of info:
http://developer.anscamobile.com/forum/2012/01/05/welcome-inneractive
inneractive claims it’s a Corona-side issue and Ansca says, well, they haven’t said anything. [import]uid: 64596 topic_id: 21227 reply_id: 84101[/import]