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It's a new-ish type of super boosters that remain active until you clear the level. I started seeing them 10 days ago around level 4450. No idea if level matters though.
You need regular pre-level boosters + an extra ingredient you get by clearing a level on the first try.
Downside of power pops is you can't change the one you've used. Having one active doesn't guarantee success. The Colour Break for example is very situational, as sometimes it might not even proc. Moreover, it doesn't activate if you've run out of moves which is very annoying.
Almost forgot - there's a limit of the ingredients you can keep at any one time, so either use them every now and then, or keep them for really tough levels.
Jesus... I got the same problem now too - can't use gold to make up for missing ingredients. I was able to mix only after getting a sufficient amount of ingredients.
Seems the bug is more widely spread.