Accidentally dragged widget out of group; Top/Left set to (0,0); NOT undo-able
While trying to change the order of an widget within its group by dragging (because Edit > Order > menu items are all disabled — an unreported bug/undocumented misfeature), I accidentally dragged it outside the group in the outline. The widget's Top/Left values were reset to 0,0.
Undo put the item back into the group, but did not restore its location.
This is very possibly related to: How to copy and paste an item within the same container without wasting all of my time [/b], as the behavior (and the steps required to fix it) are practically identical.