The icons not should disappear in permanent way, just for a few seconds, same for the task bar, this happen when Elephant gain control of the Dial, no is a tech issue.
Anyway I suggest setup run on startup so Elephant is there ready when you start your computer.
Haptic feeback is available on Elephant when sensitivity is not higher, example:
When you use the Dial to send MIDI or send hotkeys, and sensitivity is setup to lower values (actions per rotation/degrees), or when you setup sensitivity of the Dial form Elephant menu, haptic feedback is there.
Enable haptic feedback when the dial is commanding actions per 1 degree of rotation or less (higher sensitivity), just result as a bee buzzing in your hands and not have any kind of sense, is noisy, drain the battery, is uncomfortable etc. Microsoft itself also suggest not do that and I agree with they.
From MS dev notes:
Tools with continuous or high rotational sensitivity should disable haptic feedback**
Haptic feedback matches the rotational sensitivity of the active tool. We recommend disabling haptic feedback for tools with continuous or high rotational sensitivity as the user experience can get uncomfortable.
They are right!