Lost work from the mit app inventor

I program several blocks and it works in the emulator I even install it on my device, however when I close my computer and reopen the project to continue modifying it, the programming blocks were erased, I try to recover the work by means of the secured iaa copy but in this one they also appear as erased

Can you share your aia file so we can take a look at it..

Which server are you using?