Try downgrading to a lower OS. Try one from AVEATurkey_9700_220.127.116.116 - Downloads - BlackBerryOS.com and review All In One Guide - How To Upgrade Your Device - with Pictures & Videos. I'd delete AppWorld first before loading the .576OS. Then after the OS install, download the AppWorld and see what happens. I say this because I have been reading that the .600 series OS have had issues with different apps.
At this point, that's what I would try. What do you think?