If you try to follow the hyperlink of a text region, you have to use Ctrl-Click. It can easily happen (with trackpoint or touchpad as pointing device) that you slightly move the mouse while you press the button and hold Ctrl.
This is then interpreted as Ctrl-Drag. If the drag is small enough, the region is cloned in-place. This can be seen in slightly heavier font but there is no chance to recover if undo is not available.
In some cases, I had to delete spurious instances of a region manually from the xml file.
Proposal: Never clone in-place
- either don't clone at all if the region would be at the same location as the original
- or clone with a minimum offset of one canvas step to allow individual selection of instances.