On my Galaxy Tab 2 10.1 running Android 1.2.4:
The A button makes a noise when I touch it, but does not select the monster receiving the spell, for spells like Resurrection, Haste, and Immolation aura. Only upon multiple tries, sometimes moving off and back onto the monster, before the spell works. So I just don’t use those spells, takes too much time.
Might be unique to my device, which is entering obsolescence.