I have now found what causes iMini to crash. It is because of my Bluetooth QWERTY keyboard.
To reproduce the issue
Open iMini
Select Save
When the Onscreen keyboard appears press shift on QWERTY keyboard to 'wake it up'
Onscreen keyboard disappears as always happens once BT keyboard is connected.
Press DELETE key on keyboard and iMini exits without trace.
If I do the same thing with the Keyboard already connected to BT and awake before starting iMini then it works fine, so it seems that the act of 'waking up' the keyboard causes the issue. Starting with keyboard awake is not a workaround as it will 'go to sleep' after a preset time which I cannot control.
Has anyone else got a BT keyboard and could try and see if the same happens, to find out if it is BT keyboards in general or my specific device.
Thanks in advance
Andy