Hi Mr. Herve,
First, thanks for your reply and I’m sorry that I didn’t respond sooner– in fact, I kept looking at my account info on WP.org and it didn’t tell me there were any responses to my post! I should’ve just checked the post itself, lol.
Second, the problem has been solved and it had nothing to do with Jetpack at all (I was never convinced there was a problem with Jetpack, but someone in another forum/thread that I had created said I should probably post my tech issue to the plugin forum). It was the infamous mod_security giving me trouble! My hosting company has been kind enough to help me out and the problem, is solved!
Thank you so much for your help, though. I really do appreciate it! (:
Have a nice day!