BlackBerry users may have noticed that they can neither download the Kik Messenger app nor receive push notifications through it if they already have it on their devices. Here's Research in Motion's vague excuse and explanation for the whole mess:
RIM became aware of a number of issues and customer concerns regarding the Kik app and service. Following discussions with Kik, the app was removed from BlackBerry App World on November 12. Upon further investigation, RIM concluded that Kik had breached contractual obligations. Based on the broad scope and seriousness of the issues and concerns, RIM terminated its agreements with Kik and withdrew RIM's support for Kik's service.
As any app quirks or flaws could be fixed by an update, I'd guess that the real trouble is that RIM got a bit too nervous about Kik's similarities to its own BBM service. [BGR]