If I click several times on the block (where the mouse hand appears) the element is broken. I have to reopen the blocks tab to use it again. v5.991
A double click on a block will separate it into components that can be dragged. Usually double-clicking will reset it. You can also change to a different block set and then back to the blocks you want to use to reset it as well.
If you keep having this problem we can look into it to see if there is a bug.