I tried by myself. Opened the .kon file with an html editor, set the zoom defaults to 0, And.... Now it runs. No black screen.
Because of this, i changed the maps to an green one with target gridlines , the color of the rings,and deleted the green frame, now it looks cool.
If I have time i look to change the zoom problem.

I have deleted all files with have to do withthis widget. i have tried to rewrite the java script offsets, i have stopped the whole widget engine and restarted while doing this, but i still have this black blank screen. where eelse does this widget have settings?
Your help is needed, please tell us users what to do, and insert an reset button on the widget, if you cannot program an autocenter while zooming. thanks! at the moment there are much huge quakes, and the widget does not work....:-((

Use V 1.4 Zoomed in, get an blank black screen, no more possibility to zoom out.
you have to autocenter the map , that this couldnt happen. what shall the user do now. no button appears to go back to full screen.

Zoom problems and the map is too small. Would be better if it would be more preferences. But good idea.

very good idea,!!!