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Iphone 4 ios 7 detection issues

Hello,

I'm using vuforia for the past 3 years (From QCAR days)

I noticed that i got issue detection images from cloud with the new QCAR libs.

I checked with an old app using qcar from last year (ios 7 upgrade) and it detects well.

Is this a known issue ? should i downgrade my qcar lib ?

Thanks