Lost the Design of My Form! What happened?

Yesterday, I used the designer to edit the look of my form. Today, I can see that design in the editor, but if I go back into the designer to make a change, the design is gone and it's reset back to default. What the heck? Do I have to redesign it all over again? That would really suck.

A cached version of your form may have been loaded and saved into the builder which reverted your form back to previous version.  Not a problem.  It is possible to restore your form to any previously saved state using your forms revision history:

https://www.jotform.com/help/294-How-to-View-Form-Revision-History