This bug does not occur when attempting to use escape from the tab generated by using Search, or by entering and exiting without changing tabs. It is when one starts on a tab (i.e. Weapon), then switch to Vitality, that it becomes very unlikely to go back using the escape button. I haven't been able to get a consistent value, but it seems to take a combination of clicking and pressing escape for escape to start functioning again. Sometimes it takes as few as 5 escape presses, other times it takes 30+.