Why can't I see my MTEXT when it's highlighted and moved around on the screen?
Well, the concept of being able to see your highlighted text on screen started with the creation of DTEXT entities which is short for Dynamic Text.  The DTEXT is dynamic on your screen as you enter the text at the command line.  This allows you to see the relationship between other entities and your text entities as you type them at the command line.  DTEXT is also dynamic and visible when you move the entities around when they are highlighted as a selection set.  This second point is one of the major reasons why a lot of veteran users don't like to use MTEXT.  MTEXT is incredibley useful for formatting and editing, but most of the time the text is entered correct the first time and the formatting doesn't need to be too exotic to be legible. Hence the attraction to sticking with the old tried and true, simple DTEXT.  But wait!  There is a trick to being able to see that MTEXT block of text when dragging it around the screen after all.  Simply create a leader with some MTEXT attached to it using the QLEADER command and then erase the leader from the group of entities.  You are left with a special piece of MTEXT that is now visible when copying or moving.  Now all you have to do is copy this special type of viewable MTEXT instead of issuing the MTEXT command.  The next time you need some MTEXT used that can be seen when highlighted, just copy an existing piece of this special MTEXT.  A readily available block with the magic MTEXT in it could also be used.  Just explode the block to return it to the special MTEXT entity.  Enjoy this tip, I use this special MTEXT instead of DTEXT all the time now!