problem after incorrect tool resizing

Hey there! 
Sometimes it happens you're too quick while swapping between tools and accidentally hit the shortcut for the next tool before time: so it happened to me while resizing my brush tool in the quick panel (right click) and accidentally typed "i" to the brush sizing . I got the message it is incorrect but after hitting "OK" the message disappears but then photoshop does not react to any shortcuts, keeps using brush no matter what i press. Tabbing out from photoshop and back seemd to solve the issue. Ever since i experienced it is not only with the brush tool but any given tool while mistakenly setting incorrect value at resizing (eraser etc.)