Platform frozen and not working?!

 
Last night my Meta Trader 4 platform froze and is no longer running. I have been running with the demo account for just a couple weeks, and since last night, every time I log in it is still in the same spot and all market movement has stopped. Why is this happening?!
 
Market is closed during the weekend.
Besides, some brokers may disable the demo accounts because of inactivity.
 
  1. FX opens 5pm Eastern Time (NY) Sunday and ends 5pm NY Friday. Some brokers start after (6pm is common/end before (up to 15 minutes) due to low volatility.
              Checking for Market Closed - Expert Advisors and Automated Trading - MQL5 programming forum

  2. Some demo accounts have limited duration with some brokers. Some expire after lack of use with others.
              No expiration Demo accounts from Forex brokers - 100forexbrokers