Solved
Update 6.0.512.0 causes App to crash severely on iPad: After start one is able to select apps to work with, but after that one can’t access the menu buttons on top right (both of them, main and sub). A change of apps within GeoGebra Classic is no longer possible. Tapping on those buttons results in nothing. Pausing doesn’t help, restart of the app doesn’t help and restart of the iPad doesn’t help.
That’s unfortunately pretty bad.
The same problem 
Please try the new v513 version
Please try the new v513 version
new post!
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