When increasing the strength by using a potion because you carry too much, you have to touch an item in the inventory for the too-heavy-symbol to vanish and the char to be able to run again.
When increasing the strength by stats (level up) and you carried too much and could carry it now, the stamina suddenly decreases to 0 until you touch an item in your inventory, then the stamina goes up to full again and only then the too-heavy-symbol vanishes, too.
