Text which begins from = character is not shown in the locked workbook.

Excel File Compiler Screenshot

LockXLS Runtime does not allow to display formulas, so this text is blocked. If you need to show text which begins from '=' in cell, place ' '(space) character after '='.

= A1+A2 - this text will be shown in cell in protected workbook

=A1+A2 - this text will be blocked