It appears that snapshot links will not select the correct record set if there is a browse mode script trigger attached to the onLayoutEnter event.
In my case the trigger script does not include any found set actions (no find all commands, for instance)
The snapshot link always opens the window to show all records.
If I disable the script trigger; or enable it only for preview mode; the correct record set is selected.
This is occurring for me with FileMaker 11.0v4, the result is very repeatable.