mdm.update-this.com

Okay this is a first for me. My code compiles absolutely fine with no errors what so ever. But when I click 'Run' or 'Compile & Run', the little command window pops up but the output never appears? The command window tries to load the code for about 5 seconds and then it gives up, when usually it takes about 1 second to see my output.
After it tries to load, the command window stays scrolled down all the way at the bottom. Usually the code appears at the very beginning of the command window, so when I tried to scroll up, the side bar immediately pulls itself down.
I have made 9 different programs over the past 5 months and every single one of them runs fine except this one.
What I am doing in my code, is creating a class. This class is using methods to add, subtract, and multiply matrices. Assuming my code is fine, why is Dev C++ doing this?
I'd post my code, but it compiles without a hitch and it's 300+ lines of code. I'm sure nobody wants to read that much into this.
Does anyone know why this happening?
P.S. I don't even get the 'Press any key to continue..' that usually appears after your output in the command prompt window, even after waiting five minutes.