XP SP 3
Chrome 18.0.1025.168
Reproduce:
1. Have some objects/tokens
2. Click to select an object
3. Shift-click to select more objects
4. Shift-click (or ctrl-click) an already-selected object
Expected behavior:
Already-selected object is removed from selection group
Actual behavior:
Nothing (stays selected)
Workaround:
1. Click-off to de-select
2. Try again, be more careful