I just hit the Time Tokens Boost button from the overview screen for my upgrading FB, and instead of going to the token screen, coins were spent and the upgrade completed. I know this was a problem in the past but was under the impression it was fixed. Be careful.
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I had that happen to me as well, thought I didn’t have enough coins for it to take. If you close and restart the game it should fix the immediate issue as it did for me. Though the issue of it happening in the first place is well beyond me.
Same happened to me. File a ticket with support.
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Baaaaaaah kixeye steals again
Regarding the OP, I think the bug occurs when you have just collected tokens but the game hasn't realized that yet. Reloading the game has fixed the bug for me.
Except that I got to that screen from the Overview screen, that is what DIDN'T work for me. Perhaps they had it fixed by then; I really can't say. But when I clicked (once) on the Time Token Boost button, instead of going to the boost screen, coins were immediately spent just as if the button said Instant instead of Time Token Boost. Actually, I don't think you are SUPPOSED to be able to spend coins without first using any tokens you have... and I still have the tokens (but not the coins).
THAT makes sense!
I had just collected the tokens and tried to use them immediately.
Sadly, instead it spent coins as if "Instant" had been clicked.