SYMPTOM:
In Strategy Web 10.0, if all elements are selected, including "All", the Clear Selections function doesn't do anything, except refresh the page. If at least one element is not selected, then the 'Clear Selections' function selects all of the elements, the opposite of what it is supposed to do.
The image below shows the Clear selections option and shows all elements are still selected.

STEPS TO REPRODUCE:
CAUSE:
This is a known issue in Strategy Web 10.0.
ACTION:
This issue has been addressed in Strategy version 10.3 please upgrade to take advantage of the fix.