Well, the topic title pretty much explains itself. But I'll tell you about this terrible issue anyway:
(Side note: I didn't know where to put this. I have no mods, but I do have a resource pack)
My favorite texture pack (now resource pack), OzoCraft, has an update. I decided to go grab it and use it because I cannot stand default. Just my opinion. Well, everything was fine until I went to the title screen. He has a custom splash text. I do not have Optifine which is required to not have a major texture messup via splash texts. Now the font and GUI is all screwed up, even if I switch to the Default pack. My question is: How do I fix this?