weapons don't work can't pick up supplies or flags

This can be a problem with Chrome itself. Try deleting your browser data and re-entering the game. To delete your data, press Ctrl+Shift+Del, mark everything, from the dropdown menu choose "the beginning of time" and click "Clear browsing data". After the task is completed, restart Chrome and try entering the game. If you still have the same problem, try using a different browser or run the game as a separate application.