Okay, found the problem. Apparently Chrome and possibly other browsers have made a change to start warning about flash objects and the software behind CZ was loading a flash-upload option for those who have flash installed. Meaning, it was already there and likely being blocked, but now the browsers are informing users that it is being blocked most likely because browsers are finally starting to phase out flash and even Adobe itself is doing the same.
In any case, I disabled that option so it should no longer generate that error popup.