I'm having the same problem with Font of Progress. I had the mana and oil counters to activate the ability, but the game would not let me do it. I'm currently using the Android version.

WTH?? Any card, any color with abilities that do not need to tap . . . DO NOT WORK . . . when you tap mana after triggering the prompt to "activate ability".
EXTREMEMLY FRUSTRATING@!!!!!!!!!!

This just happened to me. Couldn't activate artifacts either.

Unable to activate any activated abilities from permanents (including tapping lands for mana) despite nothing preventing it.

Same issue. Activated abilities and Planeswalkers. Game is a broken mess right now. Please fix this!!!

Same here. In no game. No Planeswalker abillities or creature abillities. Nothing works for me. This is ULTRA frustrating. Lost three matches in reason to this. This is destroying the whole fun of the game.

I/We need help!

Unable to use creature for anything, active abilities not activating like they should, can't attack or block.