Text shows up in block figures on screen
 

I've attached a screenshot, but in a diagram there are a few rectangles which have text aligned top and left, and the text which is in Arial 12 shows up in block figures on screen. It plots out in readable text, just on screen I can't tell what is typed, regardless of font or size. Text is selected in blue within the light red rectangle.

Also when I select text and open format - show fonts, the cursor remains the text cursor and doesn't return to arrow cursor until something else is selected. Unfortunately the screen capture didn't capture the text cursor over the format font window.

Any fixes for these?

Update: I've attached a zip of the .graffle file with just the four text boxes and the garbled text.