First of all: Blocs 4 is SUPER! I’m very happy with ist. Many thanks to Norm and the team!
But be careful with one setting in “Project Settings”. Now you can select the Export Location. When you for example choose the desktop and you export a project, you will be asked, if you want to overwrite everything. And if you click “yes”, everything there is overwritten, means deleted.
My second thanks go to the inventor of time machine