GADSFAMILY

I was Playing this mudpack like I usually do and then all of a sudden it quit opening on the Minecraft Server. I can get on the game but I cannot get onto the server anymore. it always closes out of the entire mudpack when I attempt it. This game is great, but when I cant play it online anymore, I know I'm going to lose my houses an everything in it. Please figure out what is wrong with it or something. My gamertag is GADSFAMILY. If it does help before this all started I think I held down SHIFT then l pressed L or I held down CTRL then pressed L. Either or. But if you can, please figure out what is wrong with it. Thank you.