Had a friend call a couple months ago with the same problem. Had a model on-screen in the 2D view, typed some text and it "disappeared" after exiting the Text Editor and de-selecting the text.
Put your model on its own layer, and place your text on a different layer.
Then (as redwood said) change the order of the layers if necessary, so that your text becomes visible on top of the model in the 2D view window.
(In your Layer list, the Model layer should be above the Text layer.)
-ShopBot Buddy PRSAlpha CNC