Great resource but poor execution

This app is expensive because its a thoroughgoing scientific resource -- its not a toy or an app for casual curiosity. With that in mind, I can say that the dictionary itself is a marvellous resource, but the app is a significant disappointment . I frequently find myself vexed when I try to use it - it seems to lose various functions randomly across uses (potentially across iOS updates, though I havent tracked the breakages carefully). Currently, the search function is... functionless. Although the term "search" exists, no text box accompanies the prompt; accordingly, one cannot type in a word to search.

I wonder whether the frequent breakdowns occur because the app is offered by an organisation whose focus is geology, rather than IT and app development. Whatever the cause, the malfunctions are currently intolerable-- I spent quite a bit of money (relative to many apps) for something that should be invaluable, but is instead frustrating at its best and useless at its worst.

Bioanthro about Glossary of Geology, v2.0.2