I'm also having the exact same problem. I only got to lvl 16, so I have no problem playing again, but i just completed one of the offers to collect 400+ gems and it wont sync because the account is no longer registered. However, for some reason, all the plants I have purchased all came back, just NONE of the currency or progress.
I also have this problem for two weeks ago. And I found that the player data can't be sync to server and then crash. My three devices have some issue.
Many users compliant this issue in this forum since last week.
