problem with braille screen input on iOS 8.4

Hi all,
I have a jailbroken iPhone 6 running iOS 8.4.
Whenever i try to use braille screen input, voiceover just randomly crashes. I have tried rebooting the device, and reenabling braille screen input, but nothing seems to help. I don't know if anyone else is experiencing this, or if it is just me messing up my iPhone with jailbreak. Thanks for your help