Some pics:

Working state, all is well:
i.imgur.com/SFGU4QI.png

I zoom in, some current raster position gets invalid, all texts disappear:
i.imgur.com/cj2xVAs.png

I zoom out again, still no...

I am getting a rather odd error while displaying bitmap texts on screen and using glRasterPos3f function to position them. When I start the application, all my texts fit inside the view and...