Margin now highlighted in red when account is in danger of margin call

When you short a stock, you are borrowing shares that you do not own and selling them in hope to buy them back later at a cheaper price. You must maintain cash (called margin) to back this borrowed position (measured as short equity). Your short margin will now turn red if your account is not maintaining sufficient margin to back your short positions. If your account is in the red for too long, you will be subject to a margin call which results in forced liquidations of your positions. These transactions are labeled as margin calls on your Transactions page.