ES file explorer not accepting root explorer mode (stock 5.1.1)

i just updated and rooted stock android 5.1.1 on my xperia Z1 and ro works for everything but ES file explorer. before the update it was working (on android 5.0.1) but no matter how many times i switch the option on it just does this
asks for root permission, i grant, it switches on for 3 seconds then slides back off saying sorry test failed this feature cant run on your device.