idk what is going on but... at least CTRL+Z or CTRL+S lifts up the heights of objects
and the app just destroyed and removed the bridges + other buildings too
and ALT+TAB can crash the app too
this panel has small issues too with rolling and moving that meter it skips values and can't be moved values near 0 to +/or/-319
but at least several camera angles and several commands like F6 can crash the application.