Im playing on ios, and the free fion drones don't seem to work. They just don't spawn in any stage so now earning a decent amount of gold is impossible. The class upgrades also don't seem to work, as I cannot put points into them, even though I have points available. Please fix this as soon as possible.
Have you tired to force quit the game(Go to app switcher and swipe up the game)? I seem to have the issue at first and that units stored in storage wouldn’t show up, but a simple restart seems to fixed it.