Are you sure you turned the grid on ('Show Grid' or keyboard shortcut ".")? You can also turn the view quality to 0 and then check again. The Xara file I uploaded didn't use an outline color, just a solid fill. I checked with Xara Xara Prov8 on another machine and I can confirm this behaviour since at least version 6 on at least 3 different machines.
Please try the xara file attached:
Attachment 97219
You can make this more evident: Hold shift and press the cursor keys: 20xleft, 20xdown.
Select the Square and move it slightly, you should see it will snap back to the top left corner. It wouldn't snap if it was aligned already.
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