After a little experiment I’m willing to say on the problem a few words.
It is sad sounds, but the platform Thunkable X has serious problems due to which you may lose not only the projects along with their copies, but account as in my case.
It all started with the fact that Thunkable IDE opened a big project (more than 20 screens), which turned out to be a broken screen.
. This screen is of little value, so after creating a few months ago I had never edited, and very rarely looked through his work on the device. It worked and well. I edited the other screens and did not even know that you are working with is already broken project that cannot be recovered. When he got corrupted? Maybe a month ago, maybe 3 months ago.
Recently I accidentally opened in the block editor, a broken screen and saw numerous blocks with errors. Then in the block editor, I moved to a nearby screen and saw that the blocks with a broken screen and copied on the screen! Closed the project and opened it again - now the broken screen is 2. That is, if I open the block editor broken screen to navigate to other screens, they will also become spoiled! I realized it immediately, so continued to use Thunkable Live. As a result, in some point Thunkable Live simply ceased to connect to the account. Live Thunkable reinstallation did not solve the problem.
How to determine broken screen or not? After opening the screen in the block editor, move the mouse to any unit. If after that there are numerous blocks with errors, immediately remove the whole screen. If you have a large project, I recommend that after each update Thunkable IDE and Thunkable Live to check all the screens in the block editor.
Remember, the more screens and blocks you are using in the project Thunakble X, the more problems they can bring.