Camera [Q] Preview bug "ProCapture" camera app

I just installed the camera application "ProCapture" from the Play Store (I got it originally for my HTC One S and it works pretty good) and noticed some annoying bug. If i open the app the preview screen keeps black(Taking pictures works fine). If I minimize the app or even go to settings and back to the preview the bug has been gone.

Anyone noticed this bug too or has got a solution for it? Cause "ProCapture" is really awesome!

btw i'm on CM11 Dark (Beta 2) and normal camera app works fine :P