Today I don't know why suddenly I cannot create Mtext and cannot edit mtext, when I try to key but nothing appear on the screen.
I tried single line Text, no problem at all. That mean I canot use Mtext but can use Text.
My version of Autocad is Autocad LT 2008.
Can you type commands in on the command line but not in MTEXT
Have you tried MTEXT in a new drawing.
Try restarting your computer and try the MTEXT again.
Let us know how you go....