Suddenly the building blocks (the basic ones that are added last year not the newer ones) are gone!
They are still there! You can access them in two ways. If you select a “Bootstrap Blocks” template, they will be activated already. If you select one of the other Bootstrap 4 templates you will need to activate them. This is done by opening the “Manage libraries & plugins…” modal from the File menu. Then scroll down and activate the Bootstrap 4 Blocks.
Hope this helps,
Oh OK! Thanks Bob! found them!