Why specific objects in my drawing are shown as boxes?

What happened with the drawing? why the texts are missing? Don’t fall headache.

This is actually a setting to simplify the drawing appearance. By simplifying the text appearance, you can work with drawing faster. The system variable that responsible for this appearance is QTEXTMODE. You can turn it on/off by typing QTEXTMODE. Value 1 means it is active and 0 is inactive (default). So use it only when you don’t work with text. This system variable is stored in drawing, so it’s drawing specific. Not for all drawings.