We're experiencing and issue with Vuforia 6.2.10 / Unity 5.1.1f1 / Google Cardboard 1.20. The issue is an impossibility to focus on the see-through camera. We have experienced the issue mainly on the iPhone 5, and briefly on the Galaxy S7, although it soon disappeared. Currently it is consistently reproducing on the iPhone 5.
Our app allows us to switch to a 3D stereoscopic render (using the MixedRealityController). When viewing the 3D stereoscopic render, the distortion matrix is fine and we can comfortably view the experience - seemingly ruling out any cardboard-configuration related issues.
Commenting out the call to ApplyCorrectedProjectionMatrix(), while causing other issues (such as incorrect aspect ratio), fixes the focus issue we're getting. Obviously this is not a solution, but hoping it will help someone narrow down the problem.
I've attached some screen grabs and named them accordingly- hoping someone can shed some light onto what may be happening here!
Many Thanks in advance.