AutoCAD 2008 (as well as 2007 to the best of my knowledge) features an annoying bug where you can select some of the Mtext on the page, but not others. There does not seem to be a rhyme or reason as to which text you can or can't select. It generally occurs in paper space, but I have had it happen in model space. You just can't select some of the words you have written. I have no solution to this issue, but I do have a work-around.
When you can't select some of the things you have written as mtext in autoCAD, simply type the command QSAVE (which is short for quick save). This saves you document and, inexplicably, enables you to select all text again. If this doesn't work for some reason, save your DWG document, close AutoCAD and re-open your DWG. This is a surefire way to 'fix' this bug.
