[Zubersoft]

It may be a limitation with your tablet's memory. What kind of tablet are you currently using? Zooming in very high creates very large images to be rendered, as I'm not limiting the render region to what is shown on the screen - I render the whole page so that it doesn't change while you pan around. Typically if the screen goes black, it's either taking a long time to render the zoomed in image, or an out of memory exception was generated.