This is a rare occurrence I admit and I am aware that default tokens can bypass this problem; nevertheless, some DMs forget about Defaults in their game which leaves them with only the option to drag the avatar onto the screen. I've noticed that now and again Roll20 locks the selection drag and does this odd behavior where it highlights all text and even the players portrait but won't allow you to drag it, it even locks itself so you can't "unselect" the text and requires a refresh of the page.