Here is my problem. I created app and successfully tested it on my device (with activated developers mode). Then I submitted it to Ovi store.
I was frustrated by their answer - QA was failed.
"ACTUAL RESULT: When launching the application by pressing the application icon, a blank screen is displayed; there is no response from the application."
But application works on my device! Then I tested it on three other devices, but unfortunately all of them with activated developers mode. And app works!
But after I tested my app on another N9 without dev.mode. And I seen black screen. How it can be possible? On RDA my app works - dev. mode enabled.
App uses mobility.syteminfo. I can provide sources, here you are: http://yadi.sk/d/gLvY3-8S0PoD7
And my another app works well and already submitted to Ovi. I have any idea about it...
UPD I tested on PR 1.1 few minutes ago - it works! In mobility I use only QSystemStorageInfo...