@Pixelbits: Thank You – This solved the problem for me!
Maybe this helps pinpointing the cause:
1. I updated to Enfold 2.7.
2. Opened a page in “Text Block” item, visual editor ==> all looks OK in the Visual Editor.
3. BUT: I cancelled the edit (clicked the X in top right corner of “Text Block” editor).
4. Opened the same page again and did same action ==> I see the text, but with HTML formatting elements.
5. Closed again with “X”.
6. Opened for the third time and did same actions ==> Text is invisible (white on white background, with HTML formatting).
Please help :)