Scenario for bug "Moving objects after cropping"
1. Draw rectangle or any other object: http://screen.protema.ru/ol/2015/10.03-17829.png
2. Select region before/above
3. Crop by CTRL+ALT+P or any other special cropping tool
Result:
Some objects are moved down: http://screen.protema.ru/ol/2015/10.03-18019.png

Moreover,
1. Press CTRL+Z. Result: http://screen.protema.ru/ol/2015/10.03-18202.png
2. Press CTRL+Y. Result: http://screen.protema.ru/ol/2015/10.03-18257.png
Something wrong with Undo and Redo tools.

Suggest.
It will be more usable to set Hot-key CTRL+ENTER to save text dialog:
http://screen.protema.ru/ol/2015/10.03-18956.png
Now, this dialog is closing by pressing CTRL+ENTER without saving changed text.