So, I put a lot of charts with an indicator that takes a while to compute everything (2~3 minutes for all charts). Since I closed MetaTrader that time, when I open it the program's window doesn't show up, even though terminal.exe is running. I even changed lastprofile.ini to other standard profiles that come with metatrader, but nothing works. This happened to me with another broker as well, so it's not the broker.