The latest version 1.4.7.5 for CONTROLA it is a failure.
If you want to edit / delete a pool the system frozen, and you must to unplug to power cable form the ASIC and the PI in order to start again.
The version v1.4.6.5.1 works fine !
Was your miner turned off when doing that? I had problems switching priority orders before this, the whole system would be stuck, and a reboot was needed. Then I realized that my miner was actually turned off!
The Pi wasnt able to detect the miner in order to send new commands. That's why it was stuck.