Some users have reported an issue with text disappearing behind shapes, or when they attempt to move a box. Our development team is currently investigating the situation.
In the meantime, we have discovered a workaround so that you can bypass this issue and continue working. If your text does disappear when you move another shape, please ungroup the shapes and text. Once you've done this, you can test by moving the shape you've ungrouped to see if the issue remains.
If you have further questions or difficulties, please contact us at firstname.lastname@example.org. Thanks!