Yep, literally what I posted up there.

So basically, I cannot even ENTER the game anymore after I enter the game once, and when I try to re-enter the game, it just gets stuck on the "Connecting to server".

I've already Restarted my Computer, used different browsers, closed all my tabs and went on Incognito mode, but none of them work.

Only when the next day passes in my country, I am able to enter the game again. But as with what I said, I can only go in the game once.

Anybody know what's wrong with the Game, or my Computer?

Have you tried clearing your cookies and cache?

I can give you two solutions. The first: do it what Xzyckon said.
The second: The problem that you dont log in when you close the tab. every time when you close supermechs just go and log out. Next time when you try to go to supermechs you just have to log in again. I had the same problem. So just log out every time you leave SM and everything will be fine....dont have to clear cache and cookies all the time.

I also have to say I have experienced this problem and I can tell you that clearing cache and cookies does work however I will have to try out Mr12 suggestion as that would be a lot less hassle