Apps not accessing the SD card is not a Zest issue, but an Android KitKat security "feature" implemented by Google.... (apps can't access SD card, YouTube issues (the freezing video thing), Google Maps crashes...)
Google Maps crashing was supposed to be sorted out by the partitioning update to the firmware.
I still have an issue with most chargers (other than the Zest one) continuously linking and disconnecting while plugged in, both in the car or connected to my XP PC. Is it a voltage or ampage issue perhaps? I know the Zest charger has a 5V 1A output.

