I tried to cast a spell costing 3 mana. I clicked on an artifact to generate 1 blue. An it seemed to work did a swish effect then I cast the spell which should have tapped the remaining two lands and cast the spell. But it didn't work, seemed to keep asking me to pay more manna and it just timed out. Did not seem to recognise I'd put a blue mana with the artifact in my mana pool. Which was annoying.