It appears I've led you all on a wild goose chase. Let me explain. Now, it appears that there IS a compatibility issue, but it does not have anything to do with my operating system. I've just gone onto the Guest Account and tested the worlds, expecting them not to work. Instead, they worked perfectly fine! And that's not even the best part. After I reinstalled my Minecraft client on my computer, they worked! I guess what I'm saying is, if you're having the same issue, you should probably back up all your worlds and your server addresses.
That's right! If you want to solve the problem, you have to reinstall your Minecraft Client! One thing still puzzles me, though. I'm wondering if it had anything to do with the fact that I'd installed OptiFine in the past. I may not have found the source of the problem, but that doesn't mean I didn't find the solution. I'll allow this topic to continue if necessary. Even though I was the one who found the solution, I'd like to thank all the admins who helped me, as well as JoyJoy. I'll be fishing for a way to use commands in the worlds I've downloaded!



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